15-15a=-12a

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



15-15a=-12a

We move all terms to the left:

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

We get rid of parentheses

-15a+12a+15=0

We add all the numbers together, and all the variables

-3a+15=0

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

-3a=-15

a=-15/-3

a=+5

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