How do i make an Equip/Unequip system?

I just need to know how to make it so when you click a brick if you have enough cash, you get a tool, then you click it again, it removes the tool from your backpack.

Any help is appreciated! thanks!

local brick = workspace.Brick
local cd = Instance.new("ClickDetector")
cd.Parent = brick
local tool = game.ReplicatedStorage.Tool
local cost = 500

cd.MouseClick:Connect(function(plr)
	local plrTool = plr.Backpack:FindFirstChild(tool.Name) or plr.Character:FindFirstChild(tool.Name)
	if plrTool then
		plrTool:Destroy()
	else
		if plr.Money >= cost then
			plr.Money = plr.Money - cost
			plrTool = tool:Clone()
			plrTool.Parent = plr.Backpack
		end
	end
end)

There might be a few typos and you would have to change the variables but this is the general crux of how you would do it.