7-(3y-6)y=6

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Solution for 7-(3y-6)y=6 equation:


Simplifying
7 + -1(3y + -6) * y = 6

Reorder the terms:
7 + -1(-6 + 3y) * y = 6

Reorder the terms for easier multiplication:
7 + -1y(-6 + 3y) = 6
7 + (-6 * -1y + 3y * -1y) = 6
7 + (6y + -3y2) = 6

Solving
7 + 6y + -3y2 = 6

Solving for variable 'y'.

Reorder the terms:
7 + -6 + 6y + -3y2 = 6 + -6

Combine like terms: 7 + -6 = 1
1 + 6y + -3y2 = 6 + -6

Combine like terms: 6 + -6 = 0
1 + 6y + -3y2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-0.3333333333 + -2y + y2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -2y + 0.3333333333 + y2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -2y + y2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -2y + y2 = 0 + 0.3333333333
-2y + y2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-2y + y2 = 0.3333333333

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 0.3333333333 + 1

Reorder the terms:
1 + -2y + y2 = 0.3333333333 + 1

Combine like terms: 0.3333333333 + 1 = 1.3333333333
1 + -2y + y2 = 1.3333333333

Factor a perfect square on the left side:
(y + -1)(y + -1) = 1.3333333333

Calculate the square root of the right side: 1.154700538

Break this problem into two subproblems by setting 
(y + -1) equal to 1.154700538 and -1.154700538.

Subproblem 1

y + -1 = 1.154700538 Simplifying y + -1 = 1.154700538 Reorder the terms: -1 + y = 1.154700538 Solving -1 + y = 1.154700538 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 1.154700538 + 1 Combine like terms: -1 + 1 = 0 0 + y = 1.154700538 + 1 y = 1.154700538 + 1 Combine like terms: 1.154700538 + 1 = 2.154700538 y = 2.154700538 Simplifying y = 2.154700538

Subproblem 2

y + -1 = -1.154700538 Simplifying y + -1 = -1.154700538 Reorder the terms: -1 + y = -1.154700538 Solving -1 + y = -1.154700538 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -1.154700538 + 1 Combine like terms: -1 + 1 = 0 0 + y = -1.154700538 + 1 y = -1.154700538 + 1 Combine like terms: -1.154700538 + 1 = -0.154700538 y = -0.154700538 Simplifying y = -0.154700538

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.154700538, -0.154700538}

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