14:(2/9x) = <span> 5:15/7
</span>14:(2/9х) = 5*7/15
14:(2/9x) = 7/3
2/9x = 14:7/3
2/9х = 14*3/7
2\9х = 6
х= 6:2\9
х=6*9/2
х=27
3 1/3=10/3
5 1/6=31/6
2 3/4=11/4
1 1/2=3/2
(10/3+31/6)*2/5-11/4:(3/2-2/5)=51/6*2/5-11/4*10/11=51/15-10/4=204/60-150/60=54/60=9/10