-5a+12+3a=4a-9a

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Solution for -5a+12+3a=4a-9a equation: 



-5a+12+3a=4a-9a

We move all terms to the left:

-5a+12+3a-(4a-9a)=0

We add all the numbers together, and all the variables

-5a+3a-(-5a)+12=0

We add all the numbers together, and all the variables

-2a-(-5a)+12=0

We get rid of parentheses

-2a+5a+12=0

We add all the numbers together, and all the variables

3a+12=0

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

3a=-12

a=-12/3

a=-4

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