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