Question

Реши систему неравенств {−x+9>07x<−42

x∈(−∞; )​

Answer 1

$\displaystyle \left \{ {{-x+9>0} \atop {7x<-42}} \right. \\\\\left \{ {{x<9} \atop {x<-6}} \right.\\x\in(-\infty; 9)$