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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
135/x = 85/310 // - 85/310
135/x-(85/310) = 0
135/x-17/62 = 0
135*x^-1 = 17/62 // : 135
x^-1 = 17/8370
-1 < 0
1/(x^1) = 17/8370 // * x^1
1 = 17/8370*x^1 // : 17/8370
8370/17 = x^1
x = 8370/17
x = 8370/17
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