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(100-f)*3/5=39
We move all terms to the left:
(100-f)*3/5-(39)=0
We add all the numbers together, and all the variables
(-1f+100)*3/5-39=0
We multiply all the terms by the denominator
(-1f+100)*3-39*5=0
We add all the numbers together, and all the variables
(-1f+100)*3-195=0
We multiply parentheses
-3f+300-195=0
We add all the numbers together, and all the variables
-3f+105=0
We move all terms containing f to the left, all other terms to the right
-3f=-105
f=-105/-3
f=+35
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