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3b-36=4b-90
We move all terms to the left:
3b-36-(4b-90)=0
We get rid of parentheses
3b-4b+90-36=0
We add all the numbers together, and all the variables
-1b+54=0
We move all terms containing b to the left, all other terms to the right
-b=-54
b=-54/-1
b=+54
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