You can put this solution on YOUR website! The difference of the sum of 3 and a number and 6 is less than -2
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3 - (n+6) < -2
Or,
(n+6) - 3 < -2
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Difference has no polarity.
eg, the difference between 4 & 7 is 3
The difference between 7 & 4 is 3.