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

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


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

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

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

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

Solving
-9 + 7x = 24 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
-9 + 7x + 4x = 24 + -4x + 4x

Combine like terms: 7x + 4x = 11x
-9 + 11x = 24 + -4x + 4x

Combine like terms: -4x + 4x = 0
-9 + 11x = 24 + 0
-9 + 11x = 24

Add '9' to each side of the equation.
-9 + 9 + 11x = 24 + 9

Combine like terms: -9 + 9 = 0
0 + 11x = 24 + 9
11x = 24 + 9

Combine like terms: 24 + 9 = 33
11x = 33

Divide each side by '11'.
x = 3

Simplifying
x = 3

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