Answer:
x = 18
Step-by-step explanation:
x - (-9) = 27
Notice that there is negative sign before (-9).
If you do, turn the value into positive.
Tip:
- × - = +
+ × + = +
- × + = -
+ × - = -
Now going back,
x + 9 = 27
Subtract by 9 on both sides:
x + 9 - 9 = 27 - 9
x = 18
