-12=13a-9a

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Solution for -12=13a-9a equation: 



-12=13a-9a

We move all terms to the left:

-12-(13a-9a)=0

We add all the numbers together, and all the variables

-(+4a)-12=0

We get rid of parentheses

-4a-12=0

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

-4a=12

a=12/-4

a=-3

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