Решим уравнения.
1) 3x + 5 + 8x + 1 = 17
11x + 6 = 17
11x = 17 - 6
11x = 11
x = 11 : 11
x = 1
2) 3 - 5,8x - 2,2x - 3 = 16
-8x = 16
x = 16 : (-8)
x = -2
Ответ: 1) 1, 2) -2