Answer:
1.) You click on -15 for a point.
2.) Then you move the mouse to the left.
3.) Because x<-15, that means you do not take -15, you click on the -15 one more.
Explanation:
+ You click on -15 for a point.
+ Then you move the mouse to the left.
+ Because x<-15, that means you do not take -15, you click on the -15 one more.
That is all.
Hope you understand.
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