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3b-56=5b-90
We move all terms to the left:
3b-56-(5b-90)=0
We get rid of parentheses
3b-5b+90-56=0
We add all the numbers together, and all the variables
-2b+34=0
We move all terms containing b to the left, all other terms to the right
-2b=-34
b=-34/-2
b=+17
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