(-6 целых 1/7 + 5 целых 3/4 ) : 11/14 - (-3 целых 3/4 + 1 целая 5/6 ) : 1/6 /-Дробная...

Решите задачу:

$(-6 \frac{1}{7} +5 \frac{3}{4} ): \frac{11}{14} - (-3 \frac{3}{4}+1 \frac{5}{6}): \frac{1}{6} =-12\\ \\ 1) -6 \frac{1}{7} +5 \frac{3}{4}= -\frac{(6*7)+1}{7} + \frac{(5*4)+3}{4} = \\ \\ - \frac{-172+161}{28}=- \frac{11}{28} \\ \\ 2) -3 \frac{3}{4} + 1 \frac{5}{6} = - \frac{45-22}{12} = -\frac{23}{12} =- 1 \frac{11}{12} \\ \\ 3) - \frac{11}{28} : \frac{11}{14} = -\frac{11*14}{28*11} =- \frac{1}{2} \\ \\ 4)- \frac{23}{12} : \frac{1}{6} =- \frac{23*6}{12*1} =-11 \frac{1}{2} \\ \\$
$6) -11 \frac{1}{2} - \frac{1}{2} =-12$