Respuesta :
Well, [tex]-21=x[/tex] if [tex]x=-21[/tex] so that [tex]-21=-21[/tex] is true.
-21/1 could be the answer since it equals -21 but idk for sure. sorry
Well, [tex]-21=x[/tex] if [tex]x=-21[/tex] so that [tex]-21=-21[/tex] is true.