\(\Leftrightarrow\left[{}\begin{matrix}\dfrac{9}{4}-2x=0\\3x+\dfrac{7}{8}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=\dfrac{9}{4}\\3x=-\dfrac{7}{8}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{9}{8}\\x=-\dfrac{7}{24}\end{matrix}\right.\)