(4 целых 1/6+ 11 целых 1/4) × 4/15= 2/3y+ 5 целых 2/3
(4 1/6+11 1/4)*4/15=2/3y+5 2/3 1 1/9+3=2/3Y+17/3 -2/3Y=17/3-10/9-3 -2/3Y=1 5/9 Y=1 5/9 : (-2/3) Y=-2 1/3