-3a+15=12a+30

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Solution for -3a+15=12a+30 equation: 



-3a+15=12a+30

We move all terms to the left:

-3a+15-(12a+30)=0

We get rid of parentheses

-3a-12a-30+15=0

We add all the numbers together, and all the variables

-15a-15=0

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

-15a=15

a=15/-15

a=-1

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