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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/30 = 8/x // - 8/x
6/30-(8/x) = 0
6/30-8*x^-1 = 0
-8*x^-1 = -1/5 // : -8
x^-1 = 1/40
-1 < 0
1/(x^1) = 1/40 // * x^1
1 = 1/40*x^1 // : 1/40
40 = x^1
x = 40
x = 40
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