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-15+20b+4b=17+20b
We move all terms to the left:
-15+20b+4b-(17+20b)=0
We add all the numbers together, and all the variables
20b+4b-(20b+17)-15=0
We add all the numbers together, and all the variables
24b-(20b+17)-15=0
We get rid of parentheses
24b-20b-17-15=0
We add all the numbers together, and all the variables
4b-32=0
We move all terms containing b to the left, all other terms to the right
4b=32
b=32/4
b=8
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