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3b+57=8b+90
We move all terms to the left:
3b+57-(8b+90)=0
We get rid of parentheses
3b-8b-90+57=0
We add all the numbers together, and all the variables
-5b-33=0
We move all terms containing b to the left, all other terms to the right
-5b=33
b=33/-5
b=-6+3/5
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