help with non unity game hacking

So I found this function which handles the subtracting coins from player wallet every time they purchase. __text:0000000101D17A3C SUB W8, W8, W24 __text:0000000101D17A40 STR W8, [X0,#0x38] 0x101d17a3c being the one that's doing the subtracting the cost from the player wallet and putting the difference back into the wallet im guessing. When I look @ my watch points 0x101d17a40 is the address that shows the value in the wallet before then the value in the wallet after the previous function. Basically, my question why when I make the SUB an ADD it still subtracts cost instead of adding it?

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