X+a+12=3a+12

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Solution for X+a+12=3a+12 equation: 



X+X+12=3X+12

We move all terms to the left:

X+X+12-(3X+12)=0

We add all the numbers together, and all the variables

2X-(3X+12)+12=0

We get rid of parentheses

2X-3X-12+12=0

We add all the numbers together, and all the variables

-X=0

X=0/-1

X=0

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