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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
150/x = 85 // - 85
150/x-85 = 0
150*x^-1 = 85 // : 150
x^-1 = 17/30
-1 < 0
1/(x^1) = 17/30 // * x^1
1 = 17/30*x^1 // : 17/30
30/17 = x^1
x = 30/17
x = 30/17
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