Question 237993
.


How @Penguin presents his plot, is not a traditional or canonical form.


The canonical plot is presented below



a > 5


3..........4..........5..........6..........7...........8
<--------------(====================>



Notice using the parenthesis &nbsp;" ( ", &nbsp;which defines the &nbsp;OPEN &nbsp;interval at the point &nbsp;5,

which (point) &nbsp;IS &nbsp;NOT &nbsp;included to the solution set.