Question

5/6+x:2/5=7/2

Answer 1

x:2/5=7/2-5/6

x:2/5=8/3

x=8/3.2/5

x=16/15

Answer 2

=>x:2/5=7/2-5/6=21/6-5/6=16/6=8/3

=>x=8/3x2/5=16/15

Answer 3

5/6 + x : 2/5 = 7/2
         x : 2/5 = 7/2 - 5/6
         x : 2/5 = 16/6
         x         = 16/6 : 2/5
         x         = 80/12 = 20/3