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33b=40b-7
We move all terms to the left:
33b-(40b-7)=0
We get rid of parentheses
33b-40b+7=0
We add all the numbers together, and all the variables
-7b+7=0
We move all terms containing b to the left, all other terms to the right
-7b=-7
b=-7/-7
b=1
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