3a+12=-6a-15

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Solution for 3a+12=-6a-15 equation: 



3a+12=-6a-15

We move all terms to the left:

3a+12-(-6a-15)=0

We get rid of parentheses

3a+6a+15+12=0

We add all the numbers together, and all the variables

9a+27=0

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

9a=-27

a=-27/9

a=-3

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