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5b-(2b+7)=-4
We move all terms to the left:
5b-(2b+7)-(-4)=0
We add all the numbers together, and all the variables
5b-(2b+7)+4=0
We get rid of parentheses
5b-2b-7+4=0
We add all the numbers together, and all the variables
3b-3=0
We move all terms containing b to the left, all other terms to the right
3b=3
b=3/3
b=1
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