Doubt from section formula of 3d Geometry

In illustration 21 i am getting for part (-1,-1,33/7) but answer they say answer is (-3/7,-1,33/7), similarly for second part i am getting (-25,23,-9) but they say answer is (-21,23,-9). Who is correct?

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You're correct bro. There is definetly an error in the book.

P.S. You should trust your multiplication, addition and division.

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