Решите уравнение:
1) $\frac{7x}{6} - \frac{5x}{18} = \frac{4}{27}$;
2) $\frac{2x}{7} + \frac{x}{4} = \frac{15}{14}$;
3) $-\frac{x}{8} + 1 = \frac{x}{12}$.
$\frac{7x}{6} - \frac{5x}{18} = \frac{4}{27}$
$\frac{21x - 5x}{18} = \frac{4}{27}$
$\frac{16}{18}x = \frac{4}{27}$
$x = \frac{4}{27} : \frac{8}{9}$
$x = \frac{4}{27} * \frac{9}{8}$
$x = \frac{1}{3} * \frac{1}{2}$
$x = \frac{1}{6}$
$\frac{2x}{7} + \frac{x}{4} = \frac{15}{14}$
$\frac{8x + 7x}{28} = \frac{15}{14}$
$\frac{15}{28}x = \frac{15}{14}$
$x = \frac{15}{14} : \frac{15}{28}$
$x = \frac{15}{14} * \frac{28}{15}$
x = 2
$-\frac{x}{8} + 1 = \frac{x}{12}$
$-\frac{x}{8} - \frac{x}{12} = -1$
$\frac{-3x - 2x}{24} = -1$
$\frac{-5}{24}x = -1$
$x = -1 : -\frac{5}{24}$
$x = \frac{24}{5}$
$x = 4\frac{4}{5}$
x = 4,8
Пожауйста, оцените решение