f the lengths of the two legs of a right triangle are 2x and 2x+4 and the length of the hypotenuse is 4x-4, then x is equal to 6 and x=0.

(2x)^2 + (2x + 4)^2 = (4x -- 4)^2 gives x = 0, 6 whence hypotenuse 4x -- 4 is 20