Question 1084300
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express in the terms of absolute value of the inequality 7 < x < 15
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Let "c" be the midpoint between 7 and 15: c = {{{(7+15)/2}}} = 11, and 

let "d" be the distance from this midpoint to either endpoint: d = 15 - c = c - 7 = 4.


Then your inequality is 

|x - c| < d,   or   |x - 7| < 4.
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