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14=f/4+15
We move all terms to the left:
14-(f/4+15)=0
We get rid of parentheses
-f/4-15+14=0
We multiply all the terms by the denominator
-f-15*4+14*4=0
We add all the numbers together, and all the variables
-1f-4=0
We move all terms containing f to the left, all other terms to the right
-f=4
f=4/-1
f=-4
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