(7\15+7\30+4\5):(2-1\6-1\2)
70:(5+6)+(3 1\9 -1\3)*(3*10*3\10) -

1. ((7//15)+7/30+4/5):(2-1/3-1/2)
2. ((7//15)+(7//30)+4/5):(2-1/3-1/2)
3. (0.7+4/5):(2-1/3-1/2)
4. (0.7+0.8):(2-1/3-1/2)
5. 1.5:(2-1/3-1/2)
6. 1.5:(2-(1//3)-1/2)
7. 1.5:((5//3)-1/2)
8. 1.5:((5//3)-0.5)
9. 1.5:(7//6)
10. 9//7