4 3/7 x плюс 3 1/14 x =25,5
4 3/7 x + 3 1/14 x =25,5 31/7x+43/14x=25,5 62/14x+43/14x=25,5 105/14x=25,5 x=25 5/10 : 105/14 x=255/10:105/14 x=255/10* 14/105 x=17/5 * 1 x=17/5 x= 3 2/5.