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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
705/240 = 3/x // - 3/x
705/240-(3/x) = 0
705/240-3*x^-1 = 0
-3*x^-1 = -47/16 // : -3
x^-1 = 47/48
-1 < 0
1/(x^1) = 47/48 // * x^1
1 = 47/48*x^1 // : 47/48
48/47 = x^1
x = 48/47
x = 48/47
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