9
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12f -9 = 27 12f = 27+9 12f = 36 f = 3
A foot is 12 inches. 12f=i. 12f=216. 12f/12=216/12. f=18. So there are 18 feet in 216 inches (assuming you are using the customary system).
168
If you mean: 9f+10f-12f then it is 7f simplified
It is not possible to find the expression of 2y if f(x) = 2x - 3x.