4 / 15 / (9 / 5-2 / 3 * 5 / 6) + 5 / 6

4 / 15 / (9 / 5-2 / 3 * 5 / 6) + 5 / 6

=4/[15*(5/9-2/3*5/6)]+5/6
=4/[27-25/3]+5/6
=4/[56/3]+5/6
=2/7+5/6
=47/42