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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/45 = 4/x // - 4/x
6/45-(4/x) = 0
6/45-4*x^-1 = 0
-4*x^-1 = -2/15 // : -4
x^-1 = 1/30
-1 < 0
1/(x^1) = 1/30 // * x^1
1 = 1/30*x^1 // : 1/30
30 = x^1
x = 30
x = 30
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