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-19-17f=-12f+16
We move all terms to the left:
-19-17f-(-12f+16)=0
We get rid of parentheses
-17f+12f-16-19=0
We add all the numbers together, and all the variables
-5f-35=0
We move all terms containing f to the left, all other terms to the right
-5f=35
f=35/-5
f=-7
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