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