SOLUTION: 0 less than or equal to x + 15 less than or equal to 15?

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Question 104273: 0 less than or equal to x + 15 less than or equal to 15?
Answer by BurningFlame_marc(77) About Me  (Show Source):
You can put this solution on YOUR website!
Hello!

This is my solution:
0<=x+15<=15
-15<=x<=0
I just simply subtract 15 to all sides to isolate x in the middle.
-15<=x<=0 is the final answer.