-15=-3+3a

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



-15=-3+3a

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(3a-3)-15=0

We get rid of parentheses

-3a+3-15=0

We add all the numbers together, and all the variables

-3a-12=0

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

-3a=12

a=12/-3

a=-4

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