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7f+6(f+3)=83
We move all terms to the left:
7f+6(f+3)-(83)=0
We multiply parentheses
7f+6f+18-83=0
We add all the numbers together, and all the variables
13f-65=0
We move all terms containing f to the left, all other terms to the right
13f=65
f=65/13
f=5
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