4: 2 целых 2/7=5/8:x
4: 16/7 = 5/8 :x 4*7/16 = 5/8:x 7/4 = 5/8 :x x=5/8 :7/4 =5/8 * 4/7 = 5/2*1/7=5/14
Спасибо большое))