3a+12=4a-15

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Solution for 3a+12=4a-15 equation: 



3a+12=4a-15

We move all terms to the left:

3a+12-(4a-15)=0

We get rid of parentheses

3a-4a+15+12=0

We add all the numbers together, and all the variables

-1a+27=0

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

-a=-27

a=-27/-1

a=+27

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