Mister Exam

x*y+x*z+x*k+y*z+y*k+z*k canonical form

The teacher will be very surprised to see your correct solution 😉

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The solution

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k*x + k*y + k*z + x*y + x*z + y*z = 0
$$k x + k y + k z + x y + x z + y z = 0$$
k*x + k*y + k*z + x*y + x*z + y*z = 0