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13+13b=15b-17
We move all terms to the left:
13+13b-(15b-17)=0
We get rid of parentheses
13b-15b+17+13=0
We add all the numbers together, and all the variables
-2b+30=0
We move all terms containing b to the left, all other terms to the right
-2b=-30
b=-30/-2
b=+15
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