Помогите срочно Отдам все баллы!

Решите задачу:

$- \frac{2}{7} + \frac{5}{42} = - (6\times \frac{2}{7} ) + \frac{5}{42} = \\ - \frac{12}{42} + \frac{5}{42 } = - \frac{7}{42} = - \frac{1}{6}$
$\frac{13}{14} + ( - \frac{11}{21}) = ( 3 \times \frac{13}{14} ) + ( - (2 \times \frac{11}{21})) = \\ \frac{39}{42} + ( - \frac{22}{42}) = \frac{17}{42}$
$5\frac{3}{4} + ( - 5 \frac{5}{6} ) = (3 \times \frac{23}{4} ) + ( - (2 \times \frac{35}{6} )) = \\ \frac{69}{12} + ( - \frac{70}{12}) = - \frac{1}{12}$
$- \frac{4}{9} + 1 = - \frac{4}{9} + \frac{9}{9} = \frac{5}{9}$
$1 \frac{3}{4} + ( - 8) = 1 \frac{3}{4} + ( - 7 \frac{4}{4}) = -6\frac{1}{4}$
$- \frac{5}{6} + \frac{2}{9} = - ( 3 \times \frac{5}{6} ) + (2 \times \frac{2}{9}) = \\ (-\frac{15}{18}) + \frac{4}{18} = -\frac{11}{18}$
$7 \frac{14}{22} + ( - 8 \frac{11}{11} ) = 7 \frac{14}{22} + ( - (2 \times 8\frac{11}{11} ) = \\ 7 \frac{14}{22} + ( - 8 \frac{22}{22} ) = - 1 \frac{8}{22} = - 1\frac{4}{11}$