Retrieve models that belongsToMany specific models

I've got a standard many-to-many relationship

class User {
  public function roles() {
    return $this->belongsToMany('Role');
  }
}

class Role {
  public function users() {
    return $this->belongsToMany('User');
  }
}   

And it works very well.

But I need to select all the users that has exactly two specific roles.

$roleAdmin = Role::where('name', 'admin')->first();
$roleUser = Role::where('name', 'user')->first();

$users = //which users has BOTH $roleAdmin and $roleUser ??

Is it possible to achieve this using eloquent or I need a raw query?

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