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2b=7b-50
We move all terms to the left:
2b-(7b-50)=0
We get rid of parentheses
2b-7b+50=0
We add all the numbers together, and all the variables
-5b+50=0
We move all terms containing b to the left, all other terms to the right
-5b=-50
b=-50/-5
b=+10
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