Перетащи ответ

• \(\dfrac{9x+2y}{7x}\)
• \(\dfrac{9x+2y}{7x^2}\)
• \(\dfrac{9x-2y}{7x^2}\)
• \(\dfrac{9x-2y}{7x}\)

\(\dfrac{81x^2-4y^2}{7x^2}\cdot \dfrac{x}{9x-2y}=\) [ ].