b) \(\Rightarrow\left|5-3x\right|-\dfrac{7}{4}=\dfrac{1}{4}\Rightarrow\left|5-3x\right|=2\)
\(\Rightarrow\left[{}\begin{matrix}5-3x=2\\5-3x=-2\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}3x=3\\3x=7\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{7}{3}\end{matrix}\right.\)
c) Áp dụng t/c dtsbn:
\(\dfrac{x-2}{5}=\dfrac{2-y}{3}=\dfrac{x-y-2+2}{5+3}=\dfrac{32}{8}=4\)
\(\Rightarrow\left\{{}\begin{matrix}x=4.5+2=22\\y=2-4.3=-10\end{matrix}\right.\)
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