(2/15+7/12)*30/43-2: 2 1/3 * 5/32=
=43/60*30/43-2: 2 1/3 * 5/32=
=1/2-2: 2 1/3 * 5/32=
=1/2-6/7*5/32=
=1/2-15/112=
=41/112
2/15+7/12=8/60+35/60=43/60
43/60*30/43=1/2
2: 2 1/3=2/1:7/3=2/1*3/7=6/7
6/7*5/32=3/7*5/16=15/112
1/2-15/112=56/112-15/112=41/112