Mars in 7th house. 

So, lets see what Mars can do in 7th house without any conjunction or aspect from any other planet. 1st lets see what these 2 things represent -

Mars represents our will power, courage, ability to take actions, aggressive nature, anger, our fighting ability, brother, male friends, a boy friend for a girl, a soldier, an athlete and real estate etc.

7th house is house of market place, other people (masses), business partnerships, agreements, marriage, spouse, marital happiness etc.

As it is one of the Mangalik Yoga position of Mars, conditions related to Mangalik Yoga (http://astrosaxena.com/mangalik) may be taken into consideration. Now, 1st thing which this position can make a person career-wise is Lawyer, as this is house of Legal Agreements and Court Hall and Mars is a fighter. As it is mainly a house of marriage and marital happiness, and Mars is aggression, so if a person gets married to a non-mangalik person before the maturity age of Mars (28 to 31), then there may be aggression or anger impacting marriage and marital happiness. But if Mars is matured and partner is also a Mangalik, then this position can actually give a very protective and caring spouse. But aggression and dominance towards other people or spouse is common theme of this placement. It can be beneficial in business as person will have dominating approach towards business. 

From 7th house, Mars aspects the 10th house of Career and Work Environment. Here, person remains dominating in matters of career. It can create trouble with father or bosses. 

Mars next aspect goes to 1st house and makes person highly active. 

Mars last aspect goes to 2nd house. it can make person's wealth aspect fluctuating till 30s. 

Thanks,

Swami Premanand Bharti