4x-12=-2x=21

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Solution for 4x-12=-2x=21 equation: 



4x-12=-2x=21

We move all terms to the left:

4x-12-(-2x)=0

We get rid of parentheses

4x+2x-12=0

We add all the numbers together, and all the variables

6x-12=0

We move all terms containing x to the left, all other terms to the right

6x=12

x=12/6

x=2

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