4a+12=7a-15

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Solution for 4a+12=7a-15 equation: 



4a+12=7a-15

We move all terms to the left:

4a+12-(7a-15)=0

We get rid of parentheses

4a-7a+15+12=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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