\(a,\Leftrightarrow x=\dfrac{9}{8}-\dfrac{1}{8}=1\\ b,\Leftrightarrow x^2=225\Leftrightarrow\left[{}\begin{matrix}x=15\\x=-15\end{matrix}\right.\\ c,\Leftrightarrow\left|x+\dfrac{3}{4}\right|=\dfrac{1}{8}+\dfrac{3}{4}=\dfrac{7}{8}\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{7}{8}-\dfrac{3}{4}=\dfrac{1}{8}\\x=-\dfrac{7}{8}-\dfrac{3}{4}=-\dfrac{13}{8}\end{matrix}\right.\\ d,\Leftrightarrow\dfrac{x}{5}=\dfrac{y}{-4}=\dfrac{x-2y}{5-\left(-8\right)}=\dfrac{26}{13}=2\\ \Leftrightarrow\left\{{}\begin{matrix}x=10\\y=-8\end{matrix}\right.\)
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