Theo mình x chỉ có thể bằng 0.
4x^3=4x
x^3=4x:4
x^3=x
x=1
4x3 = 4x
4x3 - 4x = 0
4x(x2 - 1) = 0
4x(x + 1)(x - 1) = 0
\(\Rightarrow\left[{}\begin{matrix}4x=0\\x+1=0\\x-1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x=-1\\x=1\end{matrix}\right.\)