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7(f-9)=53
We move all terms to the left:
7(f-9)-(53)=0
We multiply parentheses
7f-63-53=0
We add all the numbers together, and all the variables
7f-116=0
We move all terms containing f to the left, all other terms to the right
7f=116
f=116/7
f=16+4/7
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