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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
101/x = 0.7 // - 0.7
101/x-0.7 = 0
101*x^-1 = 0.7 // : 101
x^-1 = 0.00693069
-1 < 0
1/(x^1) = 0.00693069 // * x^1
1 = 0.00693069*x^1 // : 0.00693069
144.28577818 = x^1
x = 144.28577818
x = 144.28577818
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