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19=f/3-4
We move all terms to the left:
19-(f/3-4)=0
We get rid of parentheses
-f/3+4+19=0
We multiply all the terms by the denominator
-f+4*3+19*3=0
We add all the numbers together, and all the variables
-1f+69=0
We move all terms containing f to the left, all other terms to the right
-f=-69
f=-69/-1
f=+69
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