-31=8(1+4a)+7a

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Solution for -31=8(1+4a)+7a equation: 



-31=8(1+4a)+7a

We move all terms to the left:

-31-(8(1+4a)+7a)=0

We add all the numbers together, and all the variables

-(8(4a+1)+7a)-31=0



We calculate terms in parentheses: -(8(4a+1)+7a), so:

8(4a+1)+7a

We add all the numbers together, and all the variables

7a+8(4a+1)

We multiply parentheses

7a+32a+8

We add all the numbers together, and all the variables

39a+8

Back to the equation:

-(39a+8)



We get rid of parentheses

-39a-8-31=0

We add all the numbers together, and all the variables

-39a-39=0

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

-39a=39

a=39/-39

a=-1

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