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-1+20f=-19+18f
We move all terms to the left:
-1+20f-(-19+18f)=0
We add all the numbers together, and all the variables
20f-(18f-19)-1=0
We get rid of parentheses
20f-18f+19-1=0
We add all the numbers together, and all the variables
2f+18=0
We move all terms containing f to the left, all other terms to the right
2f=-18
f=-18/2
f=-9
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