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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/28 = 14.5/x // - 14.5/x
5/28-(14.5/x) = 0
5/28-14.5*x^-1 = 0
-14.5*x^-1 = -5/28 // : -14.5
x^-1 = 0.01231527
-1 < 0
1/(x^1) = 0.01231527 // * x^1
1 = 0.01231527*x^1 // : 0.01231527
81.20000617 = x^1
x = 81.20000617
x = 81.20000617
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