Jillian loves to get Valentine's cards from her friends.  This year she got 18 cards in all.  4 of those cards were from her neighbors.  The rest of the cards came from friends at school.  How many cards did Jillian get from her friends at school this year?
  
 
 
Hint:  If it helps, draw the cards in the space below.

Write the math equation: ______________________

How many cards came from friends at school?  _______