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-19b-19=15-13+2b
We move all terms to the left:
-19b-19-(15-13+2b)=0
We add all the numbers together, and all the variables
-19b-(2b+2)-19=0
We get rid of parentheses
-19b-2b-2-19=0
We add all the numbers together, and all the variables
-21b-21=0
We move all terms containing b to the left, all other terms to the right
-21b=21
b=21/-21
b=-1
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