$$( 0 ^ { 3 } + 20 ^ { 2 } + 0 ) x = 0$$
$x=0$
$$\left(0+20^{2}+0\right)x=0$$
$$\left(0+400+0\right)x=0$$
$$\left(400+0\right)x=0$$
$$400x=0$$
$$x=0$$
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