14/6=X/9
6.x=14.9
6x=126
X=126/6
X=21

15/60=60/X
15.x=60.60
15x=3600
X=3600/15
X=240

2x/15=6/9
2x.9=15.6
18x=90
X=90/18
X=5

7/6=28/3x
7.3x=28.6
21x=168
X=168/21
X=8

3x/5=2/7
3x.7=5.2
21x=10
X=21/10
X=2,1

9/2x=12/4
2x.12=9.4
24x=36
X=36/24
X=1,5

Espero ter ajudado !!!