Question

Rezolva:
11-(7x5-9x9:f:3):8=7

Answer 1

11-(7×5-9×9: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):8=4
35-27:f=4×8
35-27:f=32
35-32=27:f
3=27:f
f=27:3
f=9