a) 34x + 17x = 1173
51x = 1173
$$x = \frac{1173}{51}$$
x = 23
Ответ: x = 23
б) 48y - 25y = 437
23y = 437
$$y = \frac{437}{23}$$
y = 19
Ответ: y = 19
в) 7t + t + 27 = 99
8t + 27 = 99
8t = 99 - 27
8t = 72
$$t = \frac{72}{8}$$
t = 9
Ответ: t = 9
г) 15z - z - 16 = 82
14z - 16 = 82
14z = 82 + 16
14z = 98
$$z = \frac{98}{14}$$
z = 7
Ответ: z = 7