Just gather terms.
9f + 16f = 25f
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If you mean: 9f+10f-12f then it is 7f simplified
If: 54 = 9f Then: f = 6
Suppose 5.6 rec = F then 56.6 rec = 10F Subtracting the first from the second, 51 = 9F dividing both sides by F, F = 51/9 = 17/3 = 52/3
Suppose f = 2.811... then 10f = 28.111... so that 9f = 25.3 then f = 25.3/9 = 253/90 = 273/90
Suppose F = 3.555...then 10F = 35.555... Subtracting the first from the second gives 9F = 32 and so F = 32/9.