Решите уравнение. (х-1 целая 2/5) : 10 + 7 целых 5/12=9 ! )

(x-1 2/5):10+7 5/12 = 9
(x-1 2/5):10 = 9-7 5/12
(x-1 2/5):10 = 1 7/12
x-1 2/5 = 1 7/12*10
x-1 2/5 = 19/12*10
x-1 2/5 = 95/6
x = 95/6+1 2/5
x = 95/6+7/5
x = 475/30+42/30
x = 517/30
x=17 7/30
ответ: x=17 7/30.