8 13/35 -7 3/10= 25/28Х 8 13/35 -7 3/10 = 1 (13*10 - 3*35) /350 = 1 (130-105)/350= 1 25/ 350= 1 1/14 1 1/14=25/28Х Х= 1 1/14 :25/28=(15*28)/(14*25)=6/5 = 1 1/5 Х=1 1/5 Проверка : 7 3/10 + 25/28 * 1 1/5= 8 13/35 25/28 *6/5=15/14=1 1/14 7 3/10 + 1 1/14= 8 (3*14 +1*10) /140 = 8 52/140=8 13/35