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19+17f=19f-15
We move all terms to the left:
19+17f-(19f-15)=0
We get rid of parentheses
17f-19f+15+19=0
We add all the numbers together, and all the variables
-2f+34=0
We move all terms containing f to the left, all other terms to the right
-2f=-34
f=-34/-2
f=+17
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