3 3/4 : (2 4 /7 - 1 1/12) решите подробно ,плииз

Решите задачу:

$3 \frac{3}{4} : (2 \frac{4}{7} -1 \frac{1}{12} )=2\frac{13}{25}\\ 1)2 \frac{4}{7} -1 \frac{1}{12}=2 \frac{4*12}{7*12} -1 \frac{1*7}{12*7} =2 \frac{48}{84} -1 \frac{7}{84} =1 \frac{41}{84} \\ 2)3 \frac{3}{4} :1 \frac{41}{84} =\frac{15}{4} : \frac{125}{84} =\frac{15}{4}* \frac{84}{125} =\frac{3*5}{4}* \frac{21*4}{25*5} =\frac{3}{1}* \frac{21}{25} = \frac{63}{25} = 2\frac{13}{25}$