(5/7x-1/4)(-3/4x+1/2)=0
\(\Rightarrow\left[{}\begin{matrix}\dfrac{5}{7}x-\dfrac{1}{4}=0\\-\dfrac{3}{4}x+\dfrac{1}{2}=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}\dfrac{5}{7}x=\dfrac{1}{4}\\-\dfrac{3}{4}x=-\dfrac{1}{2}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{4}:\dfrac{5}{7}\\x=\dfrac{1}{2}:\dfrac{3}{4}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{4}.\dfrac{7}{5}\\x=\dfrac{1}{2}.\dfrac{4}{3}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{7}{20}\\x=\dfrac{4}{6}=\dfrac{2}{3}\end{matrix}\right.\)
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