-9=a+7+3a

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



-9=a+7+3a

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(4a+7)-9=0

We get rid of parentheses

-4a-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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