Kak reshit 3 3/8:(1/14x 5/7)=2,1

3 3/8:(1/14x + 5/7)=2,12,1 = 2 1/10
1/14х + 5/7 = 3 3/8 : 2 1/10
1/14х + 5/7 = 1 17/28
1/14х = 1 17/28  - 5/7
1/14х = 25/28
х = 25/28 : 1/14
х = 12,5