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5(3b-4)=55
We move all terms to the left:
5(3b-4)-(55)=0
We multiply parentheses
15b-20-55=0
We add all the numbers together, and all the variables
15b-75=0
We move all terms containing b to the left, all other terms to the right
15b=75
b=75/15
b=5
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