-5a-8a=12-7a

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Solution for -5a-8a=12-7a equation: 



-5a-8a=12-7a

We move all terms to the left:

-5a-8a-(12-7a)=0

We add all the numbers together, and all the variables

-5a-8a-(-7a+12)=0

We add all the numbers together, and all the variables

-13a-(-7a+12)=0

We get rid of parentheses

-13a+7a-12=0

We add all the numbers together, and all the variables

-6a-12=0

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

-6a=12

a=12/-6

a=-2

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