Factorise
z-7+7xy-xyz
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z - 7 + 7xy - xyz
= (z - 7) + xy(7 - z)
= (z - 7) + xy(7 - z)= (z - 7) - xy(z - 7)
= (z - 7) + xy(7 - z)= (z - 7) - xy(z - 7)= (z - 7)(1 - xy)
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x - 7 + 7xy - xyz
z - xyz -7 + 7xy
z(1-xy) - 7(1-xy)
(1-xy) (z-7)
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