Помогите... (3/4+1/6)*3+(5/6-1/2):2/9 (7/15+7/30+4/5):(2-1/3-1/2)

Решите задачу:

$( \frac{3}{4} + \frac{1}{6}) * 3 + (\frac{5}{6} - \frac{1}{2}) : \frac{2}{9} = (\frac{9}{12} + \frac{2}{12}) * 3 + (\frac{5}{6} -\frac{3}{6}) : \frac{2}{9} = \frac{11}{12} * \frac{3}{1} + \frac{2}{6} * \frac{9}{2} = \frac{11}{4} * \frac{3}{2} = \frac{33}{8} = 4.125$
$(\frac{7}{15} + \frac{7}{30} + \frac{4}{5}) : (2 - \frac{1}{3} - \frac{1}{2}) = (\frac{14}{30} + \frac{7}{30} + \frac{24}{30}) : (\frac{12}{6} - \frac{2}{6} - \frac{3}{6}) = \frac{45}{30} : \frac{7}{6} = \frac{3}{2} * \frac{6}{7} = \frac{9}{7} = 1\frac{2}{7}$