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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.4/x = 2.7/5 // - 2.7/5
4.4/x-(2.7/5) = 0
4.4/x-0.54 = 0
4.4*x^-1 = 0.54 // : 4.4
x^-1 = 0.12272727
-1 < 0
1/(x^1) = 0.12272727 // * x^1
1 = 0.12272727*x^1 // : 0.12272727
8.14814833 = x^1
x = 8.14814833
x = 8.14814833
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