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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.98/x = 0.25 // - 0.25
1.98/x-0.25 = 0
1.98*x^-1 = 0.25 // : 1.98
x^-1 = 0.12626263
-1 < 0
1/(x^1) = 0.12626263 // * x^1
1 = 0.12626263*x^1 // : 0.12626263
7.91999977 = x^1
x = 7.91999977
x = 7.91999977
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