7/9*(1 1/6 -1 : 1 1/19 - 1 1/15) + 4 2/5 :24 ПОМОГИТЕ МНЕ РЕШИТЬ!!

Решите задачу:

$\frac{7}{9} *(1 \frac{1}{6} -1 : 1 \frac{1}{19} - 1 \frac{1}{15} ) + 4 \frac{2}{5} :24=$
$= \frac{7}{9} *(\frac{7}{6} -1 : \frac{20}{19} - \frac{16}{15} ) + \frac{22}{5} :24=$
$= \frac{7}{9} *(\frac{7}{6} - \frac{19}{20} - \frac{16}{15} ) + \frac{11}{60}=$
$= \frac{7}{9} *(\frac{70}{60} - \frac{19*3}{60} - \frac{16*4}{60} ) + \frac{11}{60}=$
$= \frac{7}{9} *(-\frac{51}{60}) + \frac{11}{60}=$
$= -\frac{51*7}{60*9} + \frac{99}{60*9}= -\frac{258}{540} =-\frac{129}{270}=-\frac{43}{90}$