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Can anyone prove this theorem please?

let (X,d) be a metric space, let [tex]x \in X[/tex] , and let [tex] 0<\delta<\epsilon [/tex]. Then cl(B(x,delta)) [tex] \subset [/tex]B(x,epsilon)

let (X,d) be a metric space, let [tex]x \in X[/tex] , and let [tex] 0<\delta<\epsilon [/tex]. Then cl(B(x,delta)) [tex] \subset [/tex]B(x,epsilon)

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