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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.56 = 10/x // - 10/x
1.56-(10/x) = 0
1.56-10*x^-1 = 0
-10*x^-1 = -1.56 // : -10
x^-1 = 0.156
-1 < 0
1/(x^1) = 0.156 // * x^1
1 = 0.156*x^1 // : 0.156
6.41025641 = x^1
x = 6.41025641
x = 6.41025641
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