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11-(7×5-9×9÷f÷3)÷8=7​

Răspuns :

11-(7×5-9×9÷f÷3)÷8=7

(7×5-9×9÷f÷3)÷8=4

7×5-9×9÷f÷3=32

35-81:f:3=32

81:f:3=3

81:f=9

f=9