THIS I HAVE TO EDIT. I have to edit as $6-x$ instead of $7-x$. But the SE says at least 6 characters! From where shall I introduce more characters?

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    $\begingroup$ I went ahead and did the edit myself. I actually made some other minor changes/improvements that resulted in somewhat more than a six character difference. $\endgroup$ – user642796 Jan 21 '14 at 7:26
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    $\begingroup$ This might be a duplicate of meta.math.stackexchange.com/questions/12300/… or meta.math.stackexchange.com/questions/2216/… $\endgroup$ – Martin Sleziak Jan 21 '14 at 7:32
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    $\begingroup$ From some of the commentary on this MSO question, the main reason for the six-character minimum is that since these suggested edits must be approved by higher-rep users, by-and-large edits which only provide minor corrections are too costly for the benefit they give. $\endgroup$ – user642796 Jan 21 '14 at 7:33