If `x - y = 9` , then `(x - y/3)-(y-x/3)` =

Let x, y, z be non-zero real numbers such that x/y + y/z + z/x = 7 and y/x + z/y + x/z = 9 , then (x^3)/y^3 + y^3/z^3 + z^3/x^3 - 3 is equal to

If 5x + 9y = 5 and 125x^(3) + 729y^(3) = 120 then the vlaue of the product of x and y is

If x:y=3:7, then find (7x+3y):(9x-3y)

{:(x - 3y = 3),(3x - 9y = 2):}

Solve : (3)/(x + y ) + ( 2)/(x - y ) = 2 and (9)/(x + y ) - ( 4)/(x - y) = 1 .

If 3x + 5y = 9 and 5x + 3y = 7 , then what is the value of x + y ?