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45-b=4b-85
We move all terms to the left:
45-b-(4b-85)=0
We add all the numbers together, and all the variables
-1b-(4b-85)+45=0
We get rid of parentheses
-1b-4b+85+45=0
We add all the numbers together, and all the variables
-5b+130=0
We move all terms containing b to the left, all other terms to the right
-5b=-130
b=-130/-5
b=+26
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