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
Apx. $1.50 (USD).
"Belgique" is the French form of "Belgium", but a denomination is needed. Please post a new, separate question with that information.
0-1000 usd
150$
10F 1991
La belgique is Belgium.
If you mean: 5f+10 = 10f then the value of f works out as 2
95209
10f+deepestpart 10f+underground lake
If you mean: 9f+10f-12f then it is 7f simplified
100-1000 USD depending on specifics.
50-500 usd