Question Number 65261 by shalinu last updated on 27/Jul/19
$${solve}\mathrm{4}−{xy}+{yz}−{xz} \\ $$
Commented by mr W last updated on 27/Jul/19
$${sir},\:{please}\:{explain}\:{your}\:{question}\:{a}\:{little}! \\ $$$${at}\:{the}\:{moment}\:{it}'{s}\:{not}\:{clear}\:{what} \\ $$$${your}\:{question}\:{is}. \\ $$