6-7(x-1)x=7

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Solution for 6-7(x-1)x=7 equation:


Simplifying
6 + -7(x + -1) * x = 7

Reorder the terms:
6 + -7(-1 + x) * x = 7

Reorder the terms for easier multiplication:
6 + -7x(-1 + x) = 7
6 + (-1 * -7x + x * -7x) = 7
6 + (7x + -7x2) = 7

Solving
6 + 7x + -7x2 = 7

Solving for variable 'x'.

Reorder the terms:
6 + -7 + 7x + -7x2 = 7 + -7

Combine like terms: 6 + -7 = -1
-1 + 7x + -7x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-1 + 7x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
0.1428571429 + -1x + x2 = 0

Move the constant term to the right:

Add '-0.1428571429' to each side of the equation.
0.1428571429 + -1x + -0.1428571429 + x2 = 0 + -0.1428571429

Reorder the terms:
0.1428571429 + -0.1428571429 + -1x + x2 = 0 + -0.1428571429

Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000
0.0000000000 + -1x + x2 = 0 + -0.1428571429
-1x + x2 = 0 + -0.1428571429

Combine like terms: 0 + -0.1428571429 = -0.1428571429
-1x + x2 = -0.1428571429

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = -0.1428571429 + 0.25

Reorder the terms:
0.25 + -1x + x2 = -0.1428571429 + 0.25

Combine like terms: -0.1428571429 + 0.25 = 0.1071428571
0.25 + -1x + x2 = 0.1071428571

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 0.1071428571

Calculate the square root of the right side: 0.327326835

Break this problem into two subproblems by setting 
(x + -0.5) equal to 0.327326835 and -0.327326835.

Subproblem 1

x + -0.5 = 0.327326835 Simplifying x + -0.5 = 0.327326835 Reorder the terms: -0.5 + x = 0.327326835 Solving -0.5 + x = 0.327326835 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 0.327326835 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 0.327326835 + 0.5 x = 0.327326835 + 0.5 Combine like terms: 0.327326835 + 0.5 = 0.827326835 x = 0.827326835 Simplifying x = 0.827326835

Subproblem 2

x + -0.5 = -0.327326835 Simplifying x + -0.5 = -0.327326835 Reorder the terms: -0.5 + x = -0.327326835 Solving -0.5 + x = -0.327326835 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -0.327326835 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -0.327326835 + 0.5 x = -0.327326835 + 0.5 Combine like terms: -0.327326835 + 0.5 = 0.172673165 x = 0.172673165 Simplifying x = 0.172673165

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.827326835, 0.172673165}

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