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-15-18b=-20b+19
We move all terms to the left:
-15-18b-(-20b+19)=0
We get rid of parentheses
-18b+20b-19-15=0
We add all the numbers together, and all the variables
2b-34=0
We move all terms containing b to the left, all other terms to the right
2b=34
b=34/2
b=17
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