126=(7-x)(12-x)

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Solution for 126=(7-x)(12-x) equation:


Simplifying
126 = (7 + -1x)(12 + -1x)

Multiply (7 + -1x) * (12 + -1x)
126 = (7(12 + -1x) + -1x * (12 + -1x))
126 = ((12 * 7 + -1x * 7) + -1x * (12 + -1x))
126 = ((84 + -7x) + -1x * (12 + -1x))
126 = (84 + -7x + (12 * -1x + -1x * -1x))
126 = (84 + -7x + (-12x + 1x2))

Combine like terms: -7x + -12x = -19x
126 = (84 + -19x + 1x2)

Solving
126 = 84 + -19x + 1x2

Solving for variable 'x'.

Combine like terms: 126 + -84 = 42
42 + 19x + -1x2 = 84 + -19x + 1x2 + -84 + 19x + -1x2

Reorder the terms:
42 + 19x + -1x2 = 84 + -84 + -19x + 19x + 1x2 + -1x2

Combine like terms: 84 + -84 = 0
42 + 19x + -1x2 = 0 + -19x + 19x + 1x2 + -1x2
42 + 19x + -1x2 = -19x + 19x + 1x2 + -1x2

Combine like terms: -19x + 19x = 0
42 + 19x + -1x2 = 0 + 1x2 + -1x2
42 + 19x + -1x2 = 1x2 + -1x2

Combine like terms: 1x2 + -1x2 = 0
42 + 19x + -1x2 = 0

Factor a trinomial.
(21 + -1x)(2 + x) = 0

Subproblem 1

Set the factor '(21 + -1x)' equal to zero and attempt to solve: Simplifying 21 + -1x = 0 Solving 21 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 0 + -21 -1x = 0 + -21 Combine like terms: 0 + -21 = -21 -1x = -21 Divide each side by '-1'. x = 21 Simplifying x = 21

Subproblem 2

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Solution

x = {21, -2}

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