Mercury rules 7th and 10th house is in 7th house in Gemini

When Mercury is placed in the 7th house of a horoscope in the sign of Gemini, it indicates a strong influence of communication, intellect, and analysis on the person's marriage, partnerships, and relationships in general.

This placement indicates that the person is likely to be very intelligent and communicative in their relationships. They may be very skilled in negotiating, problem-solving, and finding solutions for any issues that may arise in their partnerships.

Such a person may have a strong desire for intellectual companionship in their relationships, and may even seek partners who are intellectually stimulating and engaging. They may also prefer partners who are communicative and expressive, and are able to articulate their thoughts and feelings effectively.

However, this placement may also indicate a tendency towards restlessness or fickleness in relationships, as well as a tendency to over-analyze or intellectualize emotional matters. Therefore, it is important for the person to find a balance between their intellectual and emotional sides in order to maintain a healthy, fulfilling relationship.