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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3075/x = 20 // - 20
3075/x-20 = 0
3075*x^-1 = 20 // : 3075
x^-1 = 4/615
-1 < 0
1/(x^1) = 4/615 // * x^1
1 = 4/615*x^1 // : 4/615
615/4 = x^1
x = 615/4
x = 615/4
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