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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15 = 14/x-2 // - 14/x-2
2-(14/x)+15 = 0
2-14*x^-1+15 = 0
-14*x^-1 = -17 // : -14
x^-1 = 17/14
-1 < 0
1/(x^1) = 17/14 // * x^1
1 = 17/14*x^1 // : 17/14
14/17 = x^1
x = 14/17
x = 14/17
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