(7x+1)(12x-9)-(-x+2)=0

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Solution for (7x+1)(12x-9)-(-x+2)=0 equation:


Simplifying
(7x + 1)(12x + -9) + -1(-1x + 2) = 0

Reorder the terms:
(1 + 7x)(12x + -9) + -1(-1x + 2) = 0

Reorder the terms:
(1 + 7x)(-9 + 12x) + -1(-1x + 2) = 0

Multiply (1 + 7x) * (-9 + 12x)
(1(-9 + 12x) + 7x * (-9 + 12x)) + -1(-1x + 2) = 0
((-9 * 1 + 12x * 1) + 7x * (-9 + 12x)) + -1(-1x + 2) = 0
((-9 + 12x) + 7x * (-9 + 12x)) + -1(-1x + 2) = 0
(-9 + 12x + (-9 * 7x + 12x * 7x)) + -1(-1x + 2) = 0
(-9 + 12x + (-63x + 84x2)) + -1(-1x + 2) = 0

Combine like terms: 12x + -63x = -51x
(-9 + -51x + 84x2) + -1(-1x + 2) = 0

Reorder the terms:
-9 + -51x + 84x2 + -1(2 + -1x) = 0
-9 + -51x + 84x2 + (2 * -1 + -1x * -1) = 0
-9 + -51x + 84x2 + (-2 + 1x) = 0

Reorder the terms:
-9 + -2 + -51x + 1x + 84x2 = 0

Combine like terms: -9 + -2 = -11
-11 + -51x + 1x + 84x2 = 0

Combine like terms: -51x + 1x = -50x
-11 + -50x + 84x2 = 0

Solving
-11 + -50x + 84x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
84 the coefficient of the squared term: 

Divide each side by '84'.
-0.130952381 + -0.5952380952x + x2 = 0

Move the constant term to the right:

Add '0.130952381' to each side of the equation.
-0.130952381 + -0.5952380952x + 0.130952381 + x2 = 0 + 0.130952381

Reorder the terms:
-0.130952381 + 0.130952381 + -0.5952380952x + x2 = 0 + 0.130952381

Combine like terms: -0.130952381 + 0.130952381 = 0.000000000
0.000000000 + -0.5952380952x + x2 = 0 + 0.130952381
-0.5952380952x + x2 = 0 + 0.130952381

Combine like terms: 0 + 0.130952381 = 0.130952381
-0.5952380952x + x2 = 0.130952381

The x term is -0.5952380952x.  Take half its coefficient (-0.2976190476).
Square it (0.08857709749) and add it to both sides.

Add '0.08857709749' to each side of the equation.
-0.5952380952x + 0.08857709749 + x2 = 0.130952381 + 0.08857709749

Reorder the terms:
0.08857709749 + -0.5952380952x + x2 = 0.130952381 + 0.08857709749

Combine like terms: 0.130952381 + 0.08857709749 = 0.21952947849
0.08857709749 + -0.5952380952x + x2 = 0.21952947849

Factor a perfect square on the left side:
(x + -0.2976190476)(x + -0.2976190476) = 0.21952947849

Calculate the square root of the right side: 0.46853973

Break this problem into two subproblems by setting 
(x + -0.2976190476) equal to 0.46853973 and -0.46853973.

Subproblem 1

x + -0.2976190476 = 0.46853973 Simplifying x + -0.2976190476 = 0.46853973 Reorder the terms: -0.2976190476 + x = 0.46853973 Solving -0.2976190476 + x = 0.46853973 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2976190476' to each side of the equation. -0.2976190476 + 0.2976190476 + x = 0.46853973 + 0.2976190476 Combine like terms: -0.2976190476 + 0.2976190476 = 0.0000000000 0.0000000000 + x = 0.46853973 + 0.2976190476 x = 0.46853973 + 0.2976190476 Combine like terms: 0.46853973 + 0.2976190476 = 0.7661587776 x = 0.7661587776 Simplifying x = 0.7661587776

Subproblem 2

x + -0.2976190476 = -0.46853973 Simplifying x + -0.2976190476 = -0.46853973 Reorder the terms: -0.2976190476 + x = -0.46853973 Solving -0.2976190476 + x = -0.46853973 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2976190476' to each side of the equation. -0.2976190476 + 0.2976190476 + x = -0.46853973 + 0.2976190476 Combine like terms: -0.2976190476 + 0.2976190476 = 0.0000000000 0.0000000000 + x = -0.46853973 + 0.2976190476 x = -0.46853973 + 0.2976190476 Combine like terms: -0.46853973 + 0.2976190476 = -0.1709206824 x = -0.1709206824 Simplifying x = -0.1709206824

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7661587776, -0.1709206824}

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