1) х + 53 = 97
х = 97 - 53
х = 44
44 + 53 = 97
97 = 97
2) 142 - х = 76
х = 142 - 76
х = 66
142 - 66 = 76
76 = 76
1) х + 53 = 97
х = 97 - 53
х = 44
44 + 53 = 97
97 = 97
2) 142 - х = 76
х = 142 - 76
х = 66
142 - 66 = 76
76 = 76