Answer:
x=9
Step-by-step explanation:
Hello!☺
[tex]Answer:\boxed{x=9}[/tex]
[tex]Explanation:[/tex]
[tex]x-21=-12[/tex]
In our first/last step, we will add 21 to both sides:
[tex]x-21+21=-12+21\\x=9[/tex]
[tex]x=9[/tex] is your answer.
Hope this helps!☺