Найди значение х в уравнениях. x + x + x = 30; x * 43 = 43 : x; x - 18 = 16 - 16; x + 20 = 12 + 8

3x = 30

x = 30 / 3

x = 10

$$43x = \frac{43}{x}$$

$$43x^2 = 43$$

$$x^2 = 1$$

$$x = \pm 1$$

x = 1 или x = -1

x - 18 = 0

x = 18

x = 18

x + 20 = 20

x = 20 - 20

x = 0