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19-20f=-17-18f
We move all terms to the left:
19-20f-(-17-18f)=0
We add all the numbers together, and all the variables
-20f-(-18f-17)+19=0
We get rid of parentheses
-20f+18f+17+19=0
We add all the numbers together, and all the variables
-2f+36=0
We move all terms containing f to the left, all other terms to the right
-2f=-36
f=-36/-2
f=+18
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