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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 98 // - 98
8/x-98 = 0
8*x^-1 = 98 // : 8
x^-1 = 49/4
-1 < 0
1/(x^1) = 49/4 // * x^1
1 = 49/4*x^1 // : 49/4
4/49 = x^1
x = 4/49
x = 4/49
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