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-4=f-15/3
We move all terms to the left:
-4-(f-15/3)=0
We add all the numbers together, and all the variables
-(f-5)-4=0
We get rid of parentheses
-f+5-4=0
We add all the numbers together, and all the variables
-1f+1=0
We move all terms containing f to the left, all other terms to the right
-f=-1
f=-1/-1
f=1
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