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7(2b+5)=63
We move all terms to the left:
7(2b+5)-(63)=0
We multiply parentheses
14b+35-63=0
We add all the numbers together, and all the variables
14b-28=0
We move all terms containing b to the left, all other terms to the right
14b=28
b=28/14
b=2
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