5 1/3:6 2/5+(12 : 3 3/5 - 2/3)*2/3+7 2/5=
16/3:32/5+(12 : 18/5 - 2/3)*2/3+37/5=
16/3*5/32+(12 *5/18 - 2/3)*2/3+37/5 =
5/6+(10/3 - 2/3)*2/3+37/5 =
5/6+8/3*2/3+37/5 = 5/6+16/3+37/5 =25/30+160/30+222/30=407/30=13.17/30
5 1/3:6 2/5+(12 : 3 3/5 - 2/3)*2/3+7 2/5=
16/3:32/5+(12 : 18/5 - 2/3)*2/3+37/5=
16/3*5/32+(12 *5/18 - 2/3)*2/3+37/5 =
5/6+(10/3 - 2/3)*2/3+37/5 =
5/6+8/3*2/3+37/5 = 5/6+16/3+37/5 =25/30+160/30+222/30=407/30=13.17/30