\(\dfrac{25}{28}:\dfrac{15}{14}\cdot\dfrac{6}{7}=\dfrac{25}{28}\cdot\dfrac{14}{15}\cdot\dfrac{6}{7}\)
\(=\dfrac{25}{15}\cdot\dfrac{14}{28}\cdot\dfrac{6}{7}=\dfrac{5}{3}\cdot\dfrac{1}{2}\cdot\dfrac{6}{7}\)
\(=\dfrac{5}{7}\)
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