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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/6 = 45/x // - 45/x
18/6-(45/x) = 0
18/6-45*x^-1 = 0
-45*x^-1 = -3 // : -45
x^-1 = 1/15
-1 < 0
1/(x^1) = 1/15 // * x^1
1 = 1/15*x^1 // : 1/15
15 = x^1
x = 15
x = 15
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