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15b+3b-13b+2b-2b=20
We move all terms to the left:
15b+3b-13b+2b-2b-(20)=0
We add all the numbers together, and all the variables
5b-20=0
We move all terms containing b to the left, all other terms to the right
5b=20
b=20/5
b=4
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