-5a+12+7a=9a-4a

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Solution for -5a+12+7a=9a-4a equation: 



-5a+12+7a=9a-4a

We move all terms to the left:

-5a+12+7a-(9a-4a)=0

We add all the numbers together, and all the variables

-5a+7a-(+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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