12+7x-21=-8(-x)+4x

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Solution for 12+7x-21=-8(-x)+4x equation:


Simplifying
12 + 7x + -21 = -8(-1x) + 4x

Reorder the terms:
12 + -21 + 7x = -8(-1x) + 4x

Combine like terms: 12 + -21 = -9
-9 + 7x = -8(-1x) + 4x

Remove parenthesis around (-1x)
-9 + 7x = -8 * -1x + 4x

Multiply -8 * -1
-9 + 7x = 8x + 4x

Combine like terms: 8x + 4x = 12x
-9 + 7x = 12x

Solving
-9 + 7x = 12x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-12x' to each side of the equation.
-9 + 7x + -12x = 12x + -12x

Combine like terms: 7x + -12x = -5x
-9 + -5x = 12x + -12x

Combine like terms: 12x + -12x = 0
-9 + -5x = 0

Add '9' to each side of the equation.
-9 + 9 + -5x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -5x = 0 + 9
-5x = 0 + 9

Combine like terms: 0 + 9 = 9
-5x = 9

Divide each side by '-5'.
x = -1.8

Simplifying
x = -1.8

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