Question

Прошу решение. Х-0.15х-0.4х=1.35

Answer 1

$x - 0.15x - 0.4x = 1.35 \\ 0.45x = 1.35 \\ x = 3$

Answer 2

х-0.15х-0.4х = 1.35
х(1-0.15-0.4) = 1.35
0.45х = 1.35
х = 1.35 / 0.45
х = 3

Ответ: 3.