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2.5(b+5)=40
We move all terms to the left:
2.5(b+5)-(40)=0
We multiply parentheses
2.5b+12.5-40=0
We add all the numbers together, and all the variables
2.5b-27.5=0
We move all terms containing b to the left, all other terms to the right
2.5b=27.5
b=27.5/2.5
b=11
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