-a+31=3(1+a)-8a

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Solution for -a+31=3(1+a)-8a equation: 



-a+31=3(1+a)-8a

We move all terms to the left:

-a+31-(3(1+a)-8a)=0

We add all the numbers together, and all the variables

-a-(3(a+1)-8a)+31=0

We add all the numbers together, and all the variables

-1a-(3(a+1)-8a)+31=0



We calculate terms in parentheses: -(3(a+1)-8a), so:

3(a+1)-8a

We add all the numbers together, and all the variables

-8a+3(a+1)

We multiply parentheses

-8a+3a+3

We add all the numbers together, and all the variables

-5a+3

Back to the equation:

-(-5a+3)



We get rid of parentheses

-1a+5a-3+31=0

We add all the numbers together, and all the variables

4a+28=0

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

4a=-28

a=-28/4

a=-7

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