half-your-age-plus-seven

There's 1300 reviews on this phrase, and no one has managed to figure out the reverse of this rule? Surely my town wasn't the brightest of the lot?

If you're 40, 27 and younger is skezy, as 40/2+7 = 27.
If you're 40, 53 and older is skezy, as 40*3/2-7 = 53.

No one here seems to know how to write a formula. Half-your-age-plus-seven

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