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15b-5b=120+40
We move all terms to the left:
15b-5b-(120+40)=0
We add all the numbers together, and all the variables
15b-5b-160=0
We add all the numbers together, and all the variables
10b-160=0
We move all terms containing b to the left, all other terms to the right
10b=160
b=160/10
b=16
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