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11_(7x5_9x9:f:3):8=7

Răspuns :

11-(7x5-9x9:f:3):8=7
(35-81:f:3):8=11-7
(35-81:f:3):8=4
35-81:f:3=4x8
35-81:f:3=32
81:f:3=35-32
81:f:3=3
81:f=3x3
81:f=9
f=81:9
f=9