Start by subtracting 10 from both sides to get
alone.
+ 10 = -5
+ 10 - 10 = -5 -10
= -15
Now divide each side by 1 to get rid of the negative.
= -15

= 15
This means that in the equation
is 15.
If you want to check if that's correct just plugin 15 for
into the equation.
+ 10 = -5
↓
-15 + 10 = -5 ✓

- Marlon Nunez