Assets\PlayerController.cs(29,29): error CS0200: Property or indexer 'Vector3.normalized' cannot be assigned to -- it is read only

I am rather new to coding and i was trying to code a game in unity. I was watching a video to see exactly how to do it and i did exactly what was shown in the video but i still got this error message:

Assets\PlayerController.cs(29,29): error CS0200: Property or indexer ‘Vector3.normalized’ cannot be assigned to – it is read only

I tried tons of different things like changing the wording and completely removing it but nothing seemed to work. Here is the code:

using System;
using System.Collections.Specialized;
using System.Security.Cryptography;
using UnityEngine;

[RequireComponent(typeof(PlayerMotor))]
public class PlayerController : MonoBehaviour {

    [SerializeField]
    private float speed = 5f;

    private PlayerMotor motor;

    void Start ()
    {
        motor = GetComponent<PlayerMotor>();
    }

    void Update ()
    {
        //Calculate movement velocity as a 3D vector
        float _xMov = Input.GetAxisRaw("Horizontal");
        float _zMov = Input.GetAxisRaw("Vertical");

        Vector3 _movHorizontal = transform.right * _xMov;
        Vector3 _movVertical = transform.forward * _zMov;

        //Final movement vector
        Vector3 _velocity = (_movHorizontal + _movVertical).normalized = speed;

        //Apply movement
        motor.Move(_velocity);

    }

}

If you spot any other possible errors then please let me know.

You have two assignment operators, I think you mean

Vector3 _velocity = (_movHorizontal + _movVertical).normalized * speed;