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10b-(4b-3)=30
We move all terms to the left:
10b-(4b-3)-(30)=0
We get rid of parentheses
10b-4b+3-30=0
We add all the numbers together, and all the variables
6b-27=0
We move all terms containing b to the left, all other terms to the right
6b=27
b=27/6
b=4+1/2
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