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17b-9=-3b+31
We move all terms to the left:
17b-9-(-3b+31)=0
We get rid of parentheses
17b+3b-31-9=0
We add all the numbers together, and all the variables
20b-40=0
We move all terms containing b to the left, all other terms to the right
20b=40
b=40/20
b=2
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