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-19f+20=-18f
We move all terms to the left:
-19f+20-(-18f)=0
We get rid of parentheses
-19f+18f+20=0
We add all the numbers together, and all the variables
-1f+20=0
We move all terms containing f to the left, all other terms to the right
-f=-20
f=-20/-1
f=+20
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