Question 3(v)
Factorise
$z - 7 + 7 x y - x y z$

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Solution

$z - 7 + 7 x y - x y z = z - x \times y \times z - 7 + 7 \times x \times y = z (1 - x y) - 7 (1 - x y) = (1 - x y) (z - 7)$

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