Lời giải:
\(5+\dfrac{x}{4}-x=\dfrac{1}{2}\)
\(\Leftrightarrow5+\dfrac{x}{4}-\dfrac{4x}{4}=\dfrac{1}{2}\)
\(\Leftrightarrow5+\dfrac{-3x}{4}=\dfrac{1}{2}\)
\(\Leftrightarrow5-\dfrac{3x}{4}=\dfrac{1}{2}\)
\(\Leftrightarrow\dfrac{3x}{4}=5-\dfrac{1}{2}\)
\(\Leftrightarrow\dfrac{3x}{4}=\dfrac{9}{2}\)
\(\Leftrightarrow3x=\dfrac{9}{2}.4\)
\(\Leftrightarrow3x=18\)
\(\Leftrightarrow x=\dfrac{18}{3}=6\)
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