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50=91-b
We move all terms to the left:
50-(91-b)=0
We add all the numbers together, and all the variables
-(-1b+91)+50=0
We get rid of parentheses
1b-91+50=0
We add all the numbers together, and all the variables
b-41=0
We move all terms containing b to the left, all other terms to the right
b=41
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