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7(4b-3)=77
We move all terms to the left:
7(4b-3)-(77)=0
We multiply parentheses
28b-21-77=0
We add all the numbers together, and all the variables
28b-98=0
We move all terms containing b to the left, all other terms to the right
28b=98
b=98/28
b=3+1/2
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