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23=f/5-20
We move all terms to the left:
23-(f/5-20)=0
We get rid of parentheses
-f/5+20+23=0
We multiply all the terms by the denominator
-f+20*5+23*5=0
We add all the numbers together, and all the variables
-1f+215=0
We move all terms containing f to the left, all other terms to the right
-f=-215
f=-215/-1
f=+215
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