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Tell me about it, Jiebi

X:0.6=9: 18

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