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Read this as a kid in the early 80s.

Two boys in our world get in a fight at school, but when they enter the principal's office they are transported to a parallel world. As I recall, they had to work together to save that world by finding several magic items (one was a thread, I think?). And in that world math and poetry were magic?

Anyone remember this?

marked as duplicate by eshier, amflare, TheLethalCarrot, Vanguard3000, RDFozz Jan 23 at 18:51

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The Hero From Otherwhere by Jay Williams. 1973.

Two boys who are enemies at school find they must rely on each other when they are transported to a strange world parallel to the one on earth.

An example cover is shown below taken from Library Thing, click the link to see a couple of other ones.

The Hero From Otherwhere front cover

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