input: 
  from typing import Tuple
  
  def linear_eq_objective(coefficients: Tuple[float, float, float], point: Tuple[float, float]) -> float:
      """ Calculate the value of the objective function for a given point in a linear equation ax + by - c.
      Given coefficients a, b, and c and a point (x, y), the function computes the value of the expression ax + by - c.
      
      >>> linear_eq_objective((3.0, 5.0, 7.0), (1.0, 2.0))
      6.0
      >>> linear_eq_objective((2.0, -1.0, 4.0), (2.0, 3.0))
      0.0
      """
      
      a, b, c = coefficients
      x, y = point
      return a * x + b * y - c
  
  # Example usage:
  result = linear_eq_objective((3.0, 5.0, 7.0), (1.0, 2.0))
  print(result)  # Output: 6.0
  
output:     a, b, c = coefficients
      x, y = point
      return a * x + b * y - c