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-17b-20=-10-15b
We move all terms to the left:
-17b-20-(-10-15b)=0
We add all the numbers together, and all the variables
-17b-(-15b-10)-20=0
We get rid of parentheses
-17b+15b+10-20=0
We add all the numbers together, and all the variables
-2b-10=0
We move all terms containing b to the left, all other terms to the right
-2b=10
b=10/-2
b=-5
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