\(4.\dfrac{2}{3}-\dfrac{x}{5}=\dfrac{13}{15}\\ \Rightarrow\dfrac{8}{3}-\dfrac{x}{5}=\dfrac{13}{15}\\ \Rightarrow\dfrac{x}{5}=\dfrac{8}{3}-\dfrac{13}{15}\\ \Rightarrow\dfrac{x}{5}=\dfrac{9}{5}\\ \Rightarrow x=9\)
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\(4.\dfrac{2}{3}-\dfrac{x}{5}=\dfrac{13}{15}\)
\(\dfrac{x}{5}=4.\dfrac{2}{3}-\dfrac{13}{15}=\dfrac{27}{15}\)
\(x:5=\dfrac{27}{15}\)
\(x=\dfrac{27}{15}.5=9\)
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