12a+9=-3a-7

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Solution for 12a+9=-3a-7 equation: 



12a+9=-3a-7

We move all terms to the left:

12a+9-(-3a-7)=0

We get rid of parentheses

12a+3a+7+9=0

We add all the numbers together, and all the variables

15a+16=0

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

15a=-16

a=-16/15

a=-1+1/15

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