3 1/3-(4 1/5x+x):5 4/7=8/15
3 1/3 - ( 4 1/5х + х) : 5 4/7) = 8/15 3 1/3 - 5 1/5х = 8/15 3 1/3 - 8/15 = 5 1/5х 10/3 - 8/15 = 26/5х 50/15 - 8/15 = 26/5х 42/15 = 26/5х 14/5 = 26/5х х = 14/5 : 26/5 х = 14/5 * 5/26 х = 7/13