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-b/9=-12
We move all terms to the left:
-b/9-(-12)=0
We add all the numbers together, and all the variables
-b/9+12=0
We multiply all the terms by the denominator
-b+12*9=0
We add all the numbers together, and all the variables
-1b+108=0
We move all terms containing b to the left, all other terms to the right
-b=-108
b=-108/-1
b=+108
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