-13=3a+7+2a

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Solution for -13=3a+7+2a equation: 



-13=3a+7+2a

We move all terms to the left:

-13-(3a+7+2a)=0

We add all the numbers together, and all the variables

-(5a+7)-13=0

We get rid of parentheses

-5a-7-13=0

We add all the numbers together, and all the variables

-5a-20=0

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

-5a=20

a=20/-5

a=-4

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