input: def check_sum_equals(x, y, z):
      '''
      Define a function that accepts three integers.
      The function should return true if one of these integers is the sum of the other two.
      In all other scenarios, it should return false.
      
      Examples
      check_sum_equals(5, 2, 7) ➞ True
      
      check_sum_equals(3, 2, 2) ➞ False
  
      check_sum_equals(3, -2, 1) ➞ True
      
      check_sum_equals(3.6, -2.2, 2) ➞ False
      '''
output:     if x == y + z or y == x + z or z == x + y:
          return True
      return False