Assets/Rotation_JavoD.js(9,65): BCE0043: Unexpected token: =.

Here I just started the script and here is my problem:
Assets/Rotation_JavoD.js(9,65): BCE0043: Unexpected token: =.

Here is my script :

static var vitesse = 10;

function Update () {
transform.Rotate(Vector3.right*Time.deltaTime*vitesse);
}

function OnGUI(){
GUI.Box (Rect(30, 90, 80, 70),"Modifier la vitesse de rotation /n /n <<--|-->>");
vitesse = GUI.HorizontalSlider (Rect (10, 130, 75, 25),vitesse, =-150.0,150.0);
}

Take a look at line 9. You have ‘=-’ towards the end. Remove the ‘=’.