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68=5f+3
We move all terms to the left:
68-(5f+3)=0
We get rid of parentheses
-5f-3+68=0
We add all the numbers together, and all the variables
-5f+65=0
We move all terms containing f to the left, all other terms to the right
-5f=-65
f=-65/-5
f=+13
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