8/6 20/x the figures are similar find x

The process:

8/6 = 20/x

You would have to cross multiply first.

8 20 6*20 = 120

6 x 8*x=8x

Then you rearrange the equation,

120=8x

And you divide by 8 (because it has the variable next to it)

120:8=15

So, x=15