how to make this script follow the player and be able to scroll to the left?

i've tried putting this script to make it scroll left, but it didn't work

local cameraHeight = 12
local cameraZOffset = 20
local cameraXChase = 10
local cameraXOffsetChase = 10
local cameraSpeed = .25

local camera = game.Workspace.CurrentCamera
local player = game.Players.LocalPlayer
local RunService = game:GetService('RunService')

local function setupCamera()
    camera.CFrame = CFrame.new(Vector3.new(0,cameraHeight,cameraZOffset),
                                        Vector3.new(0,cameraHeight,0))
end
setupCamera()
player.CharacterAdded:connect(setupCamera)

local function onUpdate()
    if player.Character and player.Character:FindFirstChild('Torso') then
        local playerX = player.Character.Torso.Position.X
        local cameraX = camera.CFrame.p.X

        if cameraX - cameraXChase < playerX then
            camera.CFrame = camera.CFrame + Vector3.new(cameraSpeed, 0, 0)
        end
    end
end

RunService:BindToRenderStep('Camera', Enum.RenderPriority.Camera.Value, onUpdate)