Номер 3
а)12 - 7 21/29 + х + 4 23/29 = 12 2/29
12 - 224/29 + х + 139/29 = 350/29
263/29 + х = 350/29
х = 350/29 - 263/29
х = 3
б)(0,95х - 1,82):1,7 = 3,4
(19/20х - 91/50) : 17/10 = 17/5
(19/20х- 91/50) : 10/17 = 17/5
19/34х - 91/50 = 17:5
95х - 182 = 578
95х = 578 + 182
95х = 760
х = 8