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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.7 = 13.5/x // - 13.5/x
2.7-(13.5/x) = 0
2.7-13.5*x^-1 = 0
-13.5*x^-1 = -2.7 // : -13.5
x^-1 = 0.2
-1 < 0
1/(x^1) = 0.2 // * x^1
1 = 0.2*x^1 // : 0.2
5 = x^1
x = 5
x = 5
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