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3f-16=20-6f
We move all terms to the left:
3f-16-(20-6f)=0
We add all the numbers together, and all the variables
3f-(-6f+20)-16=0
We get rid of parentheses
3f+6f-20-16=0
We add all the numbers together, and all the variables
9f-36=0
We move all terms containing f to the left, all other terms to the right
9f=36
f=36/9
f=4
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