Dear Ali your “proof” is built on a huge number of unstated assumptions about how mathematics works — the proof appeals to intuitions developed by working with numbers, division and multiplication, in ordinary contexts, and then extending these intuitions to a place where they cannot be extended to — that is to working with infinities.

It would be far more interesting to visualize a system where the number can be defined 7/0 — just like we can PROVE that you cannot take a square root of a negative number, but we can also define a new type of number which solves this missing element of the number system