-31=8-6a-7a

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Solution for -31=8-6a-7a equation: 



-31=8-6a-7a

We move all terms to the left:

-31-(8-6a-7a)=0

We add all the numbers together, and all the variables

-(-13a+8)-31=0

We get rid of parentheses

13a-8-31=0

We add all the numbers together, and all the variables

13a-39=0

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

13a=39

a=39/13

a=3

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