4x+12+3x-12=21

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Solution for 4x+12+3x-12=21 equation: 


Simplifying
4x + 12 + 3x + -12 = 21

Reorder the terms:
12 + -12 + 4x + 3x = 21

Combine like terms: 12 + -12 = 0
0 + 4x + 3x = 21
4x + 3x = 21

Combine like terms: 4x + 3x = 7x
7x = 21

Solving
7x = 21

Solving for variable 'x'.

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

Divide each side by '7'.
x = 3

Simplifying
x = 3

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