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(7b-7)-3(2b+1)=-3
We move all terms to the left:
(7b-7)-3(2b+1)-(-3)=0
We add all the numbers together, and all the variables
(7b-7)-3(2b+1)+3=0
We multiply parentheses
(7b-7)-6b-3+3=0
We get rid of parentheses
7b-6b-7-3+3=0
We add all the numbers together, and all the variables
b-7=0
We move all terms containing b to the left, all other terms to the right
b=7
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