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-7b-17=-4b+4
We move all terms to the left:
-7b-17-(-4b+4)=0
We get rid of parentheses
-7b+4b-4-17=0
We add all the numbers together, and all the variables
-3b-21=0
We move all terms containing b to the left, all other terms to the right
-3b=21
b=21/-3
b=-7
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