input: Write a python function to evaluate if a given formula 2*x + 4*y - z equals 10.
  assert evaluate_formula(1, 2, 0) == True
  assert evaluate_formula(2, 2, 2) == False
  assert evaluate_formula(3, 1, 0) == True
output: def evaluate_formula(x, y, z):
      return 2 * x + 4 * y - z == 10