12+7x-21=-8(3-x)+4

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Solution for 12+7x-21=-8(3-x)+4 equation:


Simplifying
12 + 7x + -21 = -8(3 + -1x) + 4

Reorder the terms:
12 + -21 + 7x = -8(3 + -1x) + 4

Combine like terms: 12 + -21 = -9
-9 + 7x = -8(3 + -1x) + 4
-9 + 7x = (3 * -8 + -1x * -8) + 4
-9 + 7x = (-24 + 8x) + 4

Reorder the terms:
-9 + 7x = -24 + 4 + 8x

Combine like terms: -24 + 4 = -20
-9 + 7x = -20 + 8x

Solving
-9 + 7x = -20 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
-9 + 7x + -8x = -20 + 8x + -8x

Combine like terms: 7x + -8x = -1x
-9 + -1x = -20 + 8x + -8x

Combine like terms: 8x + -8x = 0
-9 + -1x = -20 + 0
-9 + -1x = -20

Add '9' to each side of the equation.
-9 + 9 + -1x = -20 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = -20 + 9
-1x = -20 + 9

Combine like terms: -20 + 9 = -11
-1x = -11

Divide each side by '-1'.
x = 11

Simplifying
x = 11

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