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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/240 = 8/x // - 8/x
6/240-(8/x) = 0
6/240-8*x^-1 = 0
-8*x^-1 = -1/40 // : -8
x^-1 = 1/320
-1 < 0
1/(x^1) = 1/320 // * x^1
1 = 1/320*x^1 // : 1/320
320 = x^1
x = 320
x = 320
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