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10b-40=5b-15
We move all terms to the left:
10b-40-(5b-15)=0
We get rid of parentheses
10b-5b+15-40=0
We add all the numbers together, and all the variables
5b-25=0
We move all terms containing b to the left, all other terms to the right
5b=25
b=25/5
b=5
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