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-1+20f=11+19f
We move all terms to the left:
-1+20f-(11+19f)=0
We add all the numbers together, and all the variables
20f-(19f+11)-1=0
We get rid of parentheses
20f-19f-11-1=0
We add all the numbers together, and all the variables
f-12=0
We move all terms containing f to the left, all other terms to the right
f=12
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