Question

Find the value of x in the equation 13 - X =21

Answer 1

x=-9

Explanation:

`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`

Answer 2

- 8

Explanation:

13 - x = 21

-x = 8 Subtract 13 from both sides

x = -8 Divide both sides of -1 since x still has a negative.