input: Write a function to solve a linear equation system of the form: ax + by = c. The function should return the values of x and y as a tuple. If the equation system is unsolvable (e.g., a and b are both zero), return an empty tuple.
  
  def solve_linear_equation_system(a, b, c):
   if a == 0 and b == 0:
   return ()
   x = (c - b) / a
   y = (c - a * x) / b
   return x, y
  
  assert solve_linear_equation_system(2, 1, 4) == (2.0, 2.0)
  assert solve_linear_equation_system(1, -1, 0) == (0.0, 0.0)
  assert solve_linear_equation_system(0, 0, 0) == ()
  assert solve_linear_equation_system(3, 4, 11) == (3.0, 1.0)
  assert solve_linear_equation_system(1, 1, 2) == (2.0, 0.0)
output: def solve_linear_equation_system(a, b, c):
      if a == 0 and b == 0:
          return ()
      x = c / a
      y = 0
      return x, y