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20=1f+16
We move all terms to the left:
20-(1f+16)=0
We add all the numbers together, and all the variables
-(f+16)+20=0
We get rid of parentheses
-f-16+20=0
We add all the numbers together, and all the variables
-1f+4=0
We move all terms containing f to the left, all other terms to the right
-f=-4
f=-4/-1
f=+4
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