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2.5b+7.5=20
We move all terms to the left:
2.5b+7.5-(20)=0
We add all the numbers together, and all the variables
2.5b-12.5=0
We move all terms containing b to the left, all other terms to the right
2.5b=12.5
b=12.5/2.5
b=5
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