7x-2=2(x+1)5x-4

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Solution for 7x-2=2(x+1)5x-4 equation:


Simplifying
7x + -2 = 2(x + 1) * 5x + -4

Reorder the terms:
-2 + 7x = 2(x + 1) * 5x + -4

Reorder the terms:
-2 + 7x = 2(1 + x) * 5x + -4

Reorder the terms for easier multiplication:
-2 + 7x = 2 * 5x(1 + x) + -4

Multiply 2 * 5
-2 + 7x = 10x(1 + x) + -4
-2 + 7x = (1 * 10x + x * 10x) + -4
-2 + 7x = (10x + 10x2) + -4

Reorder the terms:
-2 + 7x = -4 + 10x + 10x2

Solving
-2 + 7x = -4 + 10x + 10x2

Solving for variable 'x'.

Reorder the terms:
-2 + 4 + 7x + -10x + -10x2 = -4 + 10x + 10x2 + 4 + -10x + -10x2

Combine like terms: -2 + 4 = 2
2 + 7x + -10x + -10x2 = -4 + 10x + 10x2 + 4 + -10x + -10x2

Combine like terms: 7x + -10x = -3x
2 + -3x + -10x2 = -4 + 10x + 10x2 + 4 + -10x + -10x2

Reorder the terms:
2 + -3x + -10x2 = -4 + 4 + 10x + -10x + 10x2 + -10x2

Combine like terms: -4 + 4 = 0
2 + -3x + -10x2 = 0 + 10x + -10x + 10x2 + -10x2
2 + -3x + -10x2 = 10x + -10x + 10x2 + -10x2

Combine like terms: 10x + -10x = 0
2 + -3x + -10x2 = 0 + 10x2 + -10x2
2 + -3x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
2 + -3x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-0.2 + 0.3x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 0.3x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 0.3x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 0.3x + x2 = 0 + 0.2
0.3x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
0.3x + x2 = 0.2

The x term is 0.3x.  Take half its coefficient (0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
0.3x + 0.0225 + x2 = 0.2 + 0.0225

Reorder the terms:
0.0225 + 0.3x + x2 = 0.2 + 0.0225

Combine like terms: 0.2 + 0.0225 = 0.2225
0.0225 + 0.3x + x2 = 0.2225

Factor a perfect square on the left side:
(x + 0.15)(x + 0.15) = 0.2225

Calculate the square root of the right side: 0.471699057

Break this problem into two subproblems by setting 
(x + 0.15) equal to 0.471699057 and -0.471699057.

Subproblem 1

x + 0.15 = 0.471699057 Simplifying x + 0.15 = 0.471699057 Reorder the terms: 0.15 + x = 0.471699057 Solving 0.15 + x = 0.471699057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = 0.471699057 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = 0.471699057 + -0.15 x = 0.471699057 + -0.15 Combine like terms: 0.471699057 + -0.15 = 0.321699057 x = 0.321699057 Simplifying x = 0.321699057

Subproblem 2

x + 0.15 = -0.471699057 Simplifying x + 0.15 = -0.471699057 Reorder the terms: 0.15 + x = -0.471699057 Solving 0.15 + x = -0.471699057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = -0.471699057 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = -0.471699057 + -0.15 x = -0.471699057 + -0.15 Combine like terms: -0.471699057 + -0.15 = -0.621699057 x = -0.621699057 Simplifying x = -0.621699057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.321699057, -0.621699057}

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