(x-1 2/5):10+7 5/12=9

(x - 1 2/5):10 + 7 5/12 = 9 x - 1 2/5 = (9 - 7 5/12)*10 x = 190/12 + 7/5 x = 950/60 + 84/60 x = 1034/60 x = 17 14/60 x = 17 7/30 Ответ: {17 7/30}