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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 85/100 // - 85/100
6/x-(85/100) = 0
6/x-17/20 = 0
6*x^-1 = 17/20 // : 6
x^-1 = 17/120
-1 < 0
1/(x^1) = 17/120 // * x^1
1 = 17/120*x^1 // : 17/120
120/17 = x^1
x = 120/17
x = 120/17
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