Răspuns :
11-(7x5-9x9:f:3):8=7
11-(35-81:f:3):8=7
11-(35-27:f):8=7
(35-27:f):8=11-7
35-27:f=4x8
27:f=35-32
27:f=3
f=27:3
f=9
11-(7*5-9*9:F:3):8=7
(7*5-9*9:F:3):8=11-7
(7*5-9*9:F:3):8=4
7*5-9*9:F:3=4*8
7*5-9*9:F:3=32
35-81:F:3=32
81:F:3=35-32
81:F:3=3
81:F=3*3
81:F=9
F=81:9
F=9
(7*5-9*9:F:3):8=11-7
(7*5-9*9:F:3):8=4
7*5-9*9:F:3=4*8
7*5-9*9:F:3=32
35-81:F:3=32
81:F:3=35-32
81:F:3=3
81:F=3*3
81:F=9
F=81:9
F=9