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12f-14=9f+10+5f
We move all terms to the left:
12f-14-(9f+10+5f)=0
We add all the numbers together, and all the variables
12f-(14f+10)-14=0
We get rid of parentheses
12f-14f-10-14=0
We add all the numbers together, and all the variables
-2f-24=0
We move all terms containing f to the left, all other terms to the right
-2f=24
f=24/-2
f=-12
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