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35+28=f+f+35
We move all terms to the left:
35+28-(f+f+35)=0
We add all the numbers together, and all the variables
-(2f+35)+35+28=0
We add all the numbers together, and all the variables
-(2f+35)+63=0
We get rid of parentheses
-2f-35+63=0
We add all the numbers together, and all the variables
-2f+28=0
We move all terms containing f to the left, all other terms to the right
-2f=-28
f=-28/-2
f=+14
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