Question Number 174203 by Michaelfaraday last updated on 27/Jul/22
$${solve}: \\ $$$${x}!=\mathrm{9}, \\ $$$${find}\:{x} \\ $$$$ \\ $$
Commented by mr W last updated on 27/Jul/22
Answered by mathocean1 last updated on 27/Jul/22
$${S}_{\mathbb{N}} =\varnothing \\ $$