-3(a+1)+31=40

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Solution for -3(a+1)+31=40 equation: 



-3(a+1)+31=40

We move all terms to the left:

-3(a+1)+31-(40)=0

We add all the numbers together, and all the variables

-3(a+1)-9=0

We multiply parentheses

-3a-3-9=0

We add all the numbers together, and all the variables

-3a-12=0

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

-3a=12

a=12/-3

a=-4

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