input: def calculate_objective(a: int, b: int, c: int, x: int, y: int) -> int:
      """
      Calculate the objective function of a linear equation given by ax + by = c.
      
      >>> calculate_objective(3, 5, 7, 1, 1)
      1
      >>> calculate_objective(3, 5, 7, 2, 2)
      5
      """
      return a * x + b * y - c
output:     return abs(a * x + b * y - c)