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15f=16f-19
We move all terms to the left:
15f-(16f-19)=0
We get rid of parentheses
15f-16f+19=0
We add all the numbers together, and all the variables
-1f+19=0
We move all terms containing f to the left, all other terms to the right
-f=-19
f=-19/-1
f=+19
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