Решите уравнение:
а) 4x + 20 = 0;
б) $\frac{3}{2}x - 6 = 0$;
в) 5x − 15 = 0;
г) $\frac{2}{5}x + 4 = 0$.
4x + 20 = 0
4x = −20
$x = -\frac{20}{4}$
x = −5
$\frac{3}{2}x - 6 = 0$
$\frac{3}{2}x = 6$
$x = 6 : \frac{3}{2}$
$x = 6 * \frac{2}{3}$
x = 2 * 2
x = 4
5x − 15 = 0
5x = 15
$x = \frac{15}{5}$
x = 3
$\frac{2}{5}x + 4 = 0$
$\frac{2}{5}x = -4$
$x = -4 : \frac{2}{5}$
$x = -4 * \frac{5}{2}$
x = −2 * 5
x = −10