4x-12=x+21

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



4x-12=x+21

We move all terms to the left:

4x-12-(x+21)=0

We get rid of parentheses

4x-x-21-12=0

We add all the numbers together, and all the variables

3x-33=0

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

3x=33

x=33/3

x=11

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