Put it right after the problem is shown, once the numbers are visible, then follow it with the No God Please No button for a bigger reaction, or cut to the Nope button when the maths is simply refused.
Sobre este som
This is a short spoken line lasting about seven seconds, delivered as a weary complaint that maths has appeared where it was not expected. It lands as a relatable groan for anyone caught out by numbers, mixing mock dismay with a shrug of defeat. The phrasing turns a schoolroom frustration into a quick, knowing reaction for everyday sums.