i assume you’re referring to the difference between the glorious mustiness of a library and the glorious plasticy newness of a bookstore. that’s probably due to the fact that as paper ages, the cellulose within it decays, letting off that sweet, sweet book smell. bookstore books haven’t had as much time to decay (unless it’s a used bookstore), leading to that different smell.

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it's a straight line which crosses the y-axis at y=2 and the x-axis at x=-6.

72 divided by -9 equals -8.