( 41 - 40 : 8 + 5 × y ) : 9 = 9
41 - 5 + 5 × y = 9 × 9
36 + 5 × y = 81
5 × y = 81 - 36
5 × y = 45
y = 45 : 5
y = 9
Salutare!
(41-40:8+5×y):9=9
41-5+5×y:9=9
36+5×y:9=9
5×y=81-36
5×y=45
y=45:5
y=9
Verificare:
(41-40:8+5×9):9=
(41-5+5×9):9=
(41-5+45):9=
(36+45):9=
81:9=
9 ✔
#Succes!