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21=3+2f
We move all terms to the left:
21-(3+2f)=0
We add all the numbers together, and all the variables
-(2f+3)+21=0
We get rid of parentheses
-2f-3+21=0
We add all the numbers together, and all the variables
-2f+18=0
We move all terms containing f to the left, all other terms to the right
-2f=-18
f=-18/-2
f=+9
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