3xyz+ 4yz+5xz+7xz-6yz+4xyz-9xyz-11zy+9xz
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Step-by-step explanation:
3xyz + 4yz + 5xz + 7xz - 6yz + 4xyz - 9xyz - 11zy + 9xz
7xyz - 9xyz + 4yz - 17yz + 21 xz
-2xyz - 13yz + 21xz
taking commons -
z(-2xy - 13y + 21x)
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