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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
57/x = -3 // + 3
57/x+3 = 0
57*x^-1 = -3 // : 57
x^-1 = -1/19
-1 < 0
1/(x^1) = -1/19 // * x^1
1 = -1/19*x^1 // : -1/19
-19 = x^1
x = -19
x = -19
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