12=-3(a-1)+31-8a

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Solution for 12=-3(a-1)+31-8a equation: 



12=-3(a-1)+31-8a

We move all terms to the left:

12-(-3(a-1)+31-8a)=0



We calculate terms in parentheses: -(-3(a-1)+31-8a), so:

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

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-8a-3a+3+31

We add all the numbers together, and all the variables

-11a+34

Back to the equation:

-(-11a+34)



We get rid of parentheses

11a-34+12=0

We add all the numbers together, and all the variables

11a-22=0

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

11a=22

a=22/11

a=2

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