18x=0.6x9
18x=5.4
x=0.3
0.5:X=9:10
9x=10x0.5
9x=5
x=5/9
7/3:x=3/8:4
3/8x=4x7/3
3/8x=28/3
224/9
6:x=9:0.3
9x=0.3x6
9x=1.8
x=0.2
0.4/:X=8:9
8x=9x0.4
8x=3.6
x=0.45