(15/23-2/46)+5 1/2=1 5/46
1.15/23-2/46=30/46-2/46=28/46
2.28/46+5 1/2=28/46+1/2=28/46+23/46=51/46=1 5/46
(15/23-2/46)+5 1/2=1 5/46
1.15/23-2/46=30/46-2/46=28/46
2.28/46+5 1/2=28/46+1/2=28/46+23/46=51/46=1 5/46