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+21)=0

We get rid of parentheses

4x+2x-21+12=0

We add all the numbers together, and all the variables

6x-9=0

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

6x=9

x=9/6

x=1+1/2

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