No Short answer
Argument
Everything was fine until Janey got to the point of deciding on the meaning of
"<"
She added the 7 to both sides correctly to get 15 on the right side.
She divided by 3 correctly getting 5 on the right hand side.
The 5 is on the right and it is the very largest value that x can nearly have. Even the open circle is recorded correctly. It means that x cannot have 5 as a value.
The problem is with left and right. x cannot exceed 5 so the line can't become more and more positive. x cannot be 10, for example.
So Janey's only error is the direction she's drawing the line. It should go left towards the negative numbers.
Footnote
You might argue that perhaps when Janey divided, she should have changed < to >.
If she was dividing by -3 that would be correct, but she was dividing by + 3. Adding the 7 did not alter the direction either. < stays the way it is and x must stay on the left.
