You can put this solution on YOUR website! It's 30 less than 15.
-15______-10_______-5_______0________5________10_________15
Note about this: When they say less than or equal to graph the number with a filled in dot, but when they say just less than or greater than use a little circle. The line above would have a filled in dot at -15 and one it 15. It represents all numbers between -15 and 15.