you can only do (#?(+, -, X, /)#?=#?) :/ Space To Change +, -, X, /. If the the text that said that in game goes away and you cant make it work, just press something. That should work.
Spaces in the number will not work. Ex 141 45 + 14 592 = Nope. Letters in numbers wont work. Ex 1m + 4m = Nope.