Sub = 3z (x+y+ 2) - 4x
(x +y+z)-2y (x-y+z)
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Step-by-step explanation:
So,
As you stated,
3zx+3zy+6z -4x^2-4xy-4zx -2xy+2y^2-2zy
= -1zx+zy-6xy-4x^2 +2y^2
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