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8(9b-4)-12=100
We move all terms to the left:
8(9b-4)-12-(100)=0
We add all the numbers together, and all the variables
8(9b-4)-112=0
We multiply parentheses
72b-32-112=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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