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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/72 = 10/x // - 10/x
14/72-(10/x) = 0
14/72-10*x^-1 = 0
-10*x^-1 = -7/36 // : -10
x^-1 = 7/360
-1 < 0
1/(x^1) = 7/360 // * x^1
1 = 7/360*x^1 // : 7/360
360/7 = x^1
x = 360/7
x = 360/7
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