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20=-f+6
We move all terms to the left:
20-(-f+6)=0
We add all the numbers together, and all the variables
-(-1f+6)+20=0
We get rid of parentheses
1f-6+20=0
We add all the numbers together, and all the variables
f+14=0
We move all terms containing f to the left, all other terms to the right
f=-14
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