Well here's a silly thing, but my high school mathematics doesn't provide me with a convincing answer can you give me one?

Thanks in advance.For any positive integer x:

x + x + x + ........ + x (x times) = x^2

Now, differentiating the above equation with respect to x.

1 + 1 + 1 + ........ + 1 (x times) = 2x

or

x = 2x

or 1=2

Nentut.