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If you mean: 9f+10f-12f then it is 7f simplified
f-18=48-10f 11f-18=48 11f=66 f=6
If: df+10f = 3 Then: f(d+10) = 3 And: d = 3/f -10
0
Suppose f = 2.811... then 10f = 28.111... so that 9f = 25.3 then f = 25.3/9 = 253/90 = 273/90