How Can I Change the Position of a Moving Object?

game.Workspace.qqw.RemoteEvent.OnServerEvent:Connect(function()
    --custom

    x = 12
    y = 10
    z = 2
    t = 5
    game.Workspace.qqw.Size = Vector3.new(x,y-t,z)

    --custom

end)

I'm using this script. I wanna use the same for position too. But positions won't be stable so I can't use variables. Please help