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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
175/x = 2/20 // - 2/20
175/x-(2/20) = 0
175/x-1/10 = 0
175*x^-1 = 1/10 // : 175
x^-1 = 1/1750
-1 < 0
1/(x^1) = 1/1750 // * x^1
1 = 1/1750*x^1 // : 1/1750
1750 = x^1
x = 1750
x = 1750
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