Question

resolva a equaçao em R: 1/x+7 > -1

Answer 1

$\frac{1}{x+7} \ \textgreater \ -1\to \\\\ -x-7\ \textgreater \ 1\to \\\\ -x\ \textgreater \ 1+7\to \\\\ -x\ \textgreater \ 8~(-1)\to \\\\ x\ \textless \ -8\\\\\\ \boxed{S=\{xER|~x\ \textless \ -8\}}$