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24=9b-7b
We move all terms to the left:
24-(9b-7b)=0
We add all the numbers together, and all the variables
-(+2b)+24=0
We get rid of parentheses
-2b+24=0
We move all terms containing b to the left, all other terms to the right
-2b=-24
b=-24/-2
b=+12
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