turunan dari fungsi y^3-2xy+2x^2-3x=0 ?

f(x) = 3.y^2 - 1.2xy + 2.2x - 1.3x = 0
f'(x) = 3y^2 - 2xy + 4x - 3x = 0
f"(x) = 3y^2 - 2xy + x = 0