question_answer

\[45\,xyz\,\,(xy+yz+{{z}^{2}})(z+x)\]\[\div \,\,105\,xy\,(xy+xz+yz+{{z}^{2}})\]when simplified is equal to:

A)  \[\frac{3z\,(3z+x)}{7}\]             

B)  \[\frac{z\,(z-x)}{7}\]

C)  \[\frac{3z\,(z-x)}{7}\]                

D)  \[\frac{3z\,(z+x)}{7}\]

E)  None of these