\(x+\frac{x}{3}=24\)
\(\Rightarrow\frac{3x}{3}+\frac{x}{3}=24\)
\(\Rightarrow\frac{3x+x}{3}=24\)
\(\Rightarrow\frac{4x}{3}=24\)
\(\Rightarrow4x=24\times3=72\)
\(\Rightarrow x=72:4=18\)
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