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b=b-50+b-43
We move all terms to the left:
b-(b-50+b-43)=0
We add all the numbers together, and all the variables
b-(2b-93)=0
We get rid of parentheses
b-2b+93=0
We add all the numbers together, and all the variables
-1b+93=0
We move all terms containing b to the left, all other terms to the right
-b=-93
b=-93/-1
b=+93
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