х:(27-19)=5х:8=5х=8*5х=40
(39+15):х=954:х=9х=54:9х=6
42:6*х=637*х=63х=63:7х=9
(68-12):х=256:х=2х=56:2х=28
х:(27-19)=5
х:8=5
х=8*5
х=40
(39+15):х=9
54:х=9
х=54:9
х=6
42:6*х=63
7*х=63
х=63:7
х=9
(68-12):х=2
56:х=2
х=56:2
х=28