-4(a+8)-(-2a+7)=31

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Solution for -4(a+8)-(-2a+7)=31 equation: 



-4(a+8)-(-2a+7)=31

We move all terms to the left:

-4(a+8)-(-2a+7)-(31)=0

We multiply parentheses

-4a-(-2a+7)-32-31=0

We get rid of parentheses

-4a+2a-7-32-31=0

We add all the numbers together, and all the variables

-2a-70=0

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

-2a=70

a=70/-2

a=-35

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