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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-65.2/x = 21.4 // - 21.4
-65.2/x-21.4 = 0
-65.2*x^-1 = 21.4 // : -65.2
x^-1 = -0.32822086
-1 < 0
1/(x^1) = -0.32822086 // * x^1
1 = -0.32822086*x^1 // : -0.32822086
-3.04672896 = x^1
x = -3.04672896
x = -3.04672896
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