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2b+5(2b+3)=75
We move all terms to the left:
2b+5(2b+3)-(75)=0
We multiply parentheses
2b+10b+15-75=0
We add all the numbers together, and all the variables
12b-60=0
We move all terms containing b to the left, all other terms to the right
12b=60
b=60/12
b=5
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