Answer:
x=-9
Step-by-step explanation:
[tex]13-x=21\\\\12-x+x=21+x\\\\12+0=21+x\\\\21+x=12\\\\21-21+x=12-21\\\\0+x=-9\\\\x=-9[/tex]
Answer:
- 8
Step-by-step explanation:
13 - x = 21
-x = 8 Subtract 13 from both sides
x = -8 Divide both sides of -1 since x still has a negative.
