Find the factors of the following expression:
$z + 7 + 7 x y + x y z$

(z+7)

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(z+x)

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(y+7)

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(1+xy)

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Solution

The correct options are
A (z+7)
D (1+xy)
$z + 7 + 7 x y + x y z$
$= (z + 7) + x y (7 + z)$
$= (z + 7) (1 + x y)$

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