From a corkboard at my college campus.

  • techt@lemmy.world
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    10 days ago

    In addition to the other great answers, you can really drive the intuition about how wrong this is in students/kids with simple examples:

    x+2/x+1 – cancel the x incorrectly and this always equals 2, which should fail the smell check immediately, verify with a couple values of x.

    x+1/x cancel the x incorrectly and undefined.