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25b=15b+30
We move all terms to the left:
25b-(15b+30)=0
We get rid of parentheses
25b-15b-30=0
We add all the numbers together, and all the variables
10b-30=0
We move all terms containing b to the left, all other terms to the right
10b=30
b=30/10
b=3
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