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20=35-3f
We move all terms to the left:
20-(35-3f)=0
We add all the numbers together, and all the variables
-(-3f+35)+20=0
We get rid of parentheses
3f-35+20=0
We add all the numbers together, and all the variables
3f-15=0
We move all terms containing f to the left, all other terms to the right
3f=15
f=15/3
f=5
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