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7(4b+1)=63
We move all terms to the left:
7(4b+1)-(63)=0
We multiply parentheses
28b+7-63=0
We add all the numbers together, and all the variables
28b-56=0
We move all terms containing b to the left, all other terms to the right
28b=56
b=56/28
b=2
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