Question

[12-9:3+(12-9):3]x z+1=41

Answer 1

[12-9:3+(12-9):3]×z+1=41
(12-3+3:3)×z+1=41
(12-3+1)×z=41-1
10z=40
z=40:10
z=4

Answer 2

[12-3+3:3]x z+1=41
[12-3+1]x z+1=41
12z-3z+z+1=41
10z=41-1
10z=40
z=40/10
z=4