Atasi untuk x
\left\{\begin{matrix}x\geq -20E\text{, }&E<0\\x\leq -20E\text{, }&E>0\\x<0\text{, }&E\leq 0\\x=-20E\text{, }&E\neq 0\\x>0\text{, }&E\geq 0\end{matrix}\right,
Atasi untuk E
\left\{\begin{matrix}E\leq -\frac{x}{20}\text{, }&x<0\\E=-\frac{x}{20}\text{, }&x\neq 0\\E\geq -\frac{x}{20}\text{, }&x>0\end{matrix}\right,
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