61-40: (2х)+17=73 37+(80-6х): 8=41 98-8*(1+63: х)=18

61-40:2х+17=73
40:2х=61+17-73
40:2х=5
2х=40/5
2х=8
х=8:2
х=4

37+(80-6х):8=41
(80-6х):8=41-37
(80-6х):8=4
80-6х=8х4
80-6х=32
6х=80-32
6х=48
х=48:6
х=8

98-8×(1+63:х)=18
8+(8×63:х)=98-18
8+504:х=80
504:х=80-8
504:х=72
х=504:72
х=7