that would be x+7
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2x + 4 < x x < -4
The average for any single number is the number itself. So the average for 7 is 7. :)
In magic the number 7 is supposed to be very powerful. This is especially true of a 7th child, which Ginny was. Ginny was an extremely talented young witch.
Harry's quidditch number is 7
Howie Morenz's number is #7.