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43=f/3+18
We move all terms to the left:
43-(f/3+18)=0
We get rid of parentheses
-f/3-18+43=0
We multiply all the terms by the denominator
-f-18*3+43*3=0
We add all the numbers together, and all the variables
-1f+75=0
We move all terms containing f to the left, all other terms to the right
-f=-75
f=-75/-1
f=+75
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