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-f-16f+12=-16f-5
We move all terms to the left:
-f-16f+12-(-16f-5)=0
We add all the numbers together, and all the variables
-17f-(-16f-5)+12=0
We get rid of parentheses
-17f+16f+5+12=0
We add all the numbers together, and all the variables
-1f+17=0
We move all terms containing f to the left, all other terms to the right
-f=-17
f=-17/-1
f=+17
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