a+9=-3a-7

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



a+9=-3a-7

We move all terms to the left:

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

We get rid of parentheses

a+3a+7+9=0

We add all the numbers together, and all the variables

4a+16=0

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

4a=-16

a=-16/4

a=-4

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