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-31=-3b-19
We move all terms to the left:
-31-(-3b-19)=0
We get rid of parentheses
3b+19-31=0
We add all the numbers together, and all the variables
3b-12=0
We move all terms containing b to the left, all other terms to the right
3b=12
b=12/3
b=4
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