We obtain the general solution and the generalized
Ulam-Hyers stability of the cubic and quartic functional equation
$4(f(3x+y)+f(3x-y))=-12(f(x+y)+f(x-y))+12(f(2x+y)+f(2x-y))-8f(y)-192f(x)+f(2y)+30f(2x)$.
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