\(\dfrac{x}{3}-\dfrac{x^2}{4}=0\\ \Leftrightarrow x\left(\dfrac{1}{3}-\dfrac{x}{4}\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\\dfrac{x}{4}=\dfrac{1}{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{4}{3}\end{matrix}\right.\)
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\(\dfrac{x}{3}-\dfrac{x^2}{4}=0\)
\(\Leftrightarrow\dfrac{4x-3x^2}{12}=0\)
\(\Leftrightarrow-3x^2+4x=0\)
\(\Leftrightarrow-3x\left(x-\dfrac{4}{3}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{4}{3}\end{matrix}\right.\)
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