Пожалуйста распишите эти уравнения 1)х3=2х+1 2)0.4х+2=х3 3)2х3=-3х 4)-1.2х-1=х3

Решите задачу:

$3x = 2x + 1 \\ x = 1$
$0.4x + 2 = 3x \\ 2.6x = 2 \\ x = \frac{2}{2.6} = \frac{20}{26} = \frac{10}{13}$
$2 \times x \times 3 = - 3x \\ 6x + 3x = 0 \\ 9x = 0 \\ x = 0$
$- 1.2x - 1 = x \times 3 \\ 3x + 1.2x = - 1 \\ 4.2x = - 1 \\ x = \frac{ - 1}{4.2} = \frac{ - 10}{42} = - \frac{5}{21}$