If you mean: 9f+10f-12f then it is 7f simplified
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Just gather terms. 9f + 16f = 25f ==========
Suppose f = 2.811... then 10f = 28.111... so that 9f = 25.3 then f = 25.3/9 = 253/90 = 273/90
Suppose f = 2.399999...then 10f = 23.99999...Subtracting the first from the second, 9f = 21.6Therefore f = 21.6/9 = 216/90 = 12/5.
Suppose F = 3.555...then 10F = 35.555... Subtracting the first from the second gives 9F = 32 and so F = 32/9.
Let F = 0.555... then 10F = 5.555... Subtracting the first from the second gives 9F = 5 Therefore F = 5/9