How do i make it print the greater number?

So I have a script of Human ARMS and Animal ARMS. Human Arms = 2 Animal Arms = 4. I want it to print 4. But in the output it says 21:42:49.144 - Workspace.Script:5: ')' expected near '='. Why?

local HumanArms = 2

local AnimalArms = 4
-- Human Arms + Human Arms = Animal Arms which is 4. 2+2 =4.
if (HumanArms + HumanAmrs = 4) then
    print("2+2=4")
    wait(2)
    print("Human Arms + Human Arms = Animal Arms which is 4. 2+2 = 4.)

else
    print("2+2 is not 4. Human Arms + Humans Arms is not 4.
end

It says Line 5 is wrong. Why?