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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 12/30 // - 12/30
8/x-(12/30) = 0
8/x-2/5 = 0
8*x^-1 = 2/5 // : 8
x^-1 = 1/20
-1 < 0
1/(x^1) = 1/20 // * x^1
1 = 1/20*x^1 // : 1/20
20 = x^1
x = 20
x = 20
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