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8(9b-3)-20=100
We move all terms to the left:
8(9b-3)-20-(100)=0
We add all the numbers together, and all the variables
8(9b-3)-120=0
We multiply parentheses
72b-24-120=0
We add all the numbers together, and all the variables
72b-144=0
We move all terms containing b to the left, all other terms to the right
72b=144
b=144/72
b=2
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