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-17f-18=-19f
We move all terms to the left:
-17f-18-(-19f)=0
We get rid of parentheses
-17f+19f-18=0
We add all the numbers together, and all the variables
2f-18=0
We move all terms containing f to the left, all other terms to the right
2f=18
f=18/2
f=9
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