<span>4 целых 3/10+ 1 целая 2/15 = 43/10 + 17/15 = 129/30 + 34/30 = 163/30 = 5 целых 13/30
</span><span>1 целая 7/15 - 1/3 = 22/15 - 1/3 = 22/15 - 5/15 = 17/15 = 1 целая 2/15
</span><span>3/8*2 целых 2/3 = 3/8 * 8/3 = 1
</span><span>7/9:2/3 = 7/9 * 3/2 = 7/5 = 1целая2/5 = 1,4
</span>5/6:2/3 = <span>5/6*3/2 = 5/4 = 1целая1/4 = 1,25</span>
Ну, как-то так должно получится
A/(2y+3)-5
A/(2y+3)-(5(2y+3))/2y+3
A/(2y+3)-(10y+15)/2y+3
(13y+14-10y-15)/2y+3=(3y-1)/2y+3
A=13y+14
Ответ:13у+14