Question

What is -13 + x = -21 ?

Answer 1

X=-8

Explanation:

rearrange

-13+x-(-21)=0

solve

13-21=-8

X=-8

Answer 2

x= -8

Explanation:

Add 13 to both sides.

-13+x= -21

+13 +13

This gives you, x= -8.