-6a-7a=13

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Solution for -6a-7a=13 equation: 



-6a-7a=13

We move all terms to the left:

-6a-7a-(13)=0

We add all the numbers together, and all the variables

-13a-13=0

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

-13a=13

a=13/-13

a=-1

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