The relationship between 2/3 of 3/4 and 3/4 of 2/3 is that the product will equal the same because in multiplication, it doesn't matter what order you put the numbers in because it will equal the same product.
Assuming you meant is

The answer would be :




Hope this helps !
Photon
However, your equation seems weird :o
You have to dive the x and the Y so R=7