It seems that you have missed the necessary options for us to answer this question, so I had to make it on my own. So based on the given problem above, Tatiana had $350, and deducted by $180 which is spent on her self. So the rest is for her family. The equation for this would be this one: Let x be the amount that Tatiana spends for her family. X = 350 - 180.
This makes x = 170. Hope this answer helps.