Hue is arranging chairs. She can form 2 rows of a given length with 4 chairs left over, or 9 rows of that
 same length if she gets 10 more chairs. Complete the equation and solve it to find how many chairs are in
 that row length. In your equation, use the variable x to represent the number of chairs in each row.
 The equation is
 There are
 chairs in each row.