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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
98/x = 71/7 // - 71/7
98/x-(71/7) = 0
98/x-71/7 = 0
98*x^-1 = 71/7 // : 98
x^-1 = 71/686
-1 < 0
1/(x^1) = 71/686 // * x^1
1 = 71/686*x^1 // : 71/686
686/71 = x^1
x = 686/71
x = 686/71
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