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Let x be the number of comic books on each shelf.
The bottom shelf has x + 20 comic books.
Each shelf has x comic books.
The total number of comic books on all shelves is 5x.
The equation is 5x = x + x + x + x + x + 20.
Combining x terms, we get 5x = 5x + 20.
Subtracting 5x from both sides gives 0 = 20.
Since this equation is not true for any value of x, there must be a mistake in the statement of the problem or in my reasoning.