input: Write a python function to convert a mathematical expression to a boolean expression.
  assert convert_to_boolean("(x + y - z) > 0") == "True True False"
  assert convert_to_boolean("x + y - z > 0") == "True True False"
  assert convert_to_boolean(" ( x + y ) > 0 ") == "True True"
  assert convert_to_boolean("x - z > 0") == "True False"
output: def convert_to_boolean(expression):
      def evaluate_expression(expr):
          # Define variables with example values
          variables = {'x': 1, 'y': 2, 'z': 3}
          
          # Replace variables in expression with their values
          for var, value in variables.items():
              expr = expr.replace(var, str(value))
          
          # Evaluate the expression
          return eval(expr)
      
      # Remove spaces from the expression
      expression = expression.replace(" ", "")
      
      # Split the expression at comparison operators
      if ">" in expression:
          left_expr, right_expr = expression.split(">")
          result = evaluate_expression(left_expr) > int(right_expr)
      elif "<" in expression:
          left_expr, right_expr = expression.split("<")
          result = evaluate_expression(left_expr) < int(right_expr)
      elif "==" in expression:
          left_expr, right_expr = expression.split("==")
          result = evaluate_expression(left_expr) == int(right_expr)
      elif ">=" in expression:
          left_expr, right_expr = expression.split(">=")
          result = evaluate_expression(left_expr) >= int(right_expr)
      elif "<=" in expression:
          left_expr, right_expr = expression.split("<=")
          result = evaluate_expression(left_expr) <= int(right_expr)
      elif "!=" in expression:
          left_expr, right_expr = expression.split("!=")
          result = evaluate_expression(left_expr) != int(right_expr)
      
      return "True" if result else "False"