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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
260 = 3/x // - 3/x
260-(3/x) = 0
260-3*x^-1 = 0
-3*x^-1 = -260 // : -3
x^-1 = 260/3
-1 < 0
1/(x^1) = 260/3 // * x^1
1 = 260/3*x^1 // : 260/3
3/260 = x^1
x = 3/260
x = 3/260
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