247 и 251 пж помогите 10 бпллов

247.
$- x = 15 \frac{4}{7} \\ x = - 15 \frac{4}{7}$

$- x = - 0.8 \\ x = 0.8$

$- x = - 4 \frac{1}{3} \\ x = 4 \frac{1}{3}$

$- x = \frac{5}{6} - \frac{1}{9} \\ - x = \frac{15}{18} - \frac{2}{18} = \frac{13}{18} \\ x = - \frac{13}{18}$

$- x = - 7.2 \\ x = 7.2$

$- x = \frac{3}{8} + \frac{1}{6} \\ - x = \frac{18}{48} + \frac{8}{48} = \frac{26}{48} = \frac{13}{24} \\ x = - \frac{13}{24}$

251. точка Е = 5, точка F = 3, точка К = -2, точка L = -4