a-15=4a+12

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



a-15=4a+12

We move all terms to the left:

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

We get rid of parentheses

a-4a-12-15=0

We add all the numbers together, and all the variables

-3a-27=0

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

-3a=27

a=27/-3

a=-9

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