9. 1.6 – (x – 2.8) = 0.2x
Раскроем скобки:
1. 6 - x + 2.8 = 0.2x
-x - 0.2x = -1.6 - 2.8
-1.2x = -4.4
x = -4.4 / -1.2
x ≈ 3.67
Ответ: 3.67