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-8-15b=-5b-20-9b
We move all terms to the left:
-8-15b-(-5b-20-9b)=0
We add all the numbers together, and all the variables
-15b-(-14b-20)-8=0
We get rid of parentheses
-15b+14b+20-8=0
We add all the numbers together, and all the variables
-1b+12=0
We move all terms containing b to the left, all other terms to the right
-b=-12
b=-12/-1
b=+12
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