7a-4a+12=-15

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



7a-4a+12=-15

We move all terms to the left:

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