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7(f-9)=63.
We move all terms to the left:
7(f-9)-(63.)=0
We add all the numbers together, and all the variables
7(f-9)-63=0
We multiply parentheses
7f-63-63=0
We add all the numbers together, and all the variables
7f-126=0
We move all terms containing f to the left, all other terms to the right
7f=126
f=126/7
f=18
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