Plowing open spaces of the Runet, came across an interesting task.
On the electronic scoreboard displays the correct mathematical equality. But one pixel of the scoreboard is faulty. Which one

Based on
braingames.ru')
PS I decided myself, do not deprive of the pleasure of your neighbor, you do not need answers in the comments immediately.
UPD: here it turned out, it’s me, but I’m the first to do it.
UDP2 : in the comments there are two explicit prompts + a link to the solution, be careful!