1/3-1/9+1/6
=9/18-2/18+3/18
=10/18
=5/9
29/16-10/21-11/21
=29/16-(10/21+11/21)
=29/16-1
=13/16
3/4-(4/5-3/4)
=3/4-4/5+3/4
=(3/4+3/4)-4/5
=3/2-4/5
=7/10
1/3-1/9+1/6
=9/18-2/18+3/18
=10/18
=5/9
29/16-10/21-11/21
=29/16-(10/21+11/21)
=29/16-1
=13/16
3/4-(4/5-3/4)
=3/4-4/5+3/4
=(3/4+3/4)-4/5
=3/2-4/5
=7/10