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11-(7×5-9×9:f:3):8=7 ajutorrrrr

Răspuns :

11-(35-81:f:3):8=7
(35-81:f:3):8=11-7=4
35-81:f:3=4×8=32
81:f:3=35-32=3
81:f=3×3
81:f=9
f=81:9
f=9