input: from typing import Tuple
  
  def linear_eq(a: float, b: float, c: float, x: float, y: float) -> float:
      """ Calculate the objective function of a linear equation of the form ax + by = c.
      The function computes a*x + b*y - c and returns the result.
  
      >>> linear_eq(3, 5, 7, 1, 1)
      1
      >>> linear_eq(3, 5, 7, 2, 2)
      5
      """
      return a*x + b*y - c
output:     return a*x + b*y - c