This is Insanity !!!

Algebra Level 4

If the value of the gigantic term is $$a$$, where ( $$a\in \mathbb{N}$$ ), then the value of $$a$$ is?

PS: Someone requested for clarification. I would like to say to them that the problem is totally legible. Open the image in a new window, then you would get what it is. Formatting it with LATEX would have been cumbersome. This is an original problem.

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