It is a complex fraction. One way we can simplify this fraction is to multiply the numerator and the denominator of the complex fraction by the LCD of both.
The LCD of the numerator and the denominator is (xy2).
The soluiton:
[1/x + 2y](xy2)
------------------
[3/x -4/y2](xy2)
y2 + 2y3
=-----------
3y2 -4x