Решение и ответ:
-3 · |2х - 17.2| = -81
|2х - 17.2| = -81 ÷ (-3)
|2х - 17.2| = 27
1) 2x - 17.2 = 27
2x = 27 + 17.2
2x = 44.2
x = 44.2 ÷ 2
x = 22.1
2) 2x - 17.2 = -27
2x = -27 + 17.2
2x = 9.8
x = -9.8 ÷ 2
x = -4.9
ответ: x = 22.1; x = -4.9
