3*y 2*y 2*y --- + --- + y - --- 7 3 3
(3*y)/7 + (2*y)/3 + y - 2*y/3 при y = 1
(3*y)/7 + (2*y)/3 + y - 2*y/3
(3*(1))/7 + (2*(1))/3 + (1) - 2*(1)/3
3/7 + 2/3 + 1 - 2/3
10/7
10*y ---- 7
1.42857142857143*y
3*y y + --- 7