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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 1.8 // - 1.8
5/x-1.8 = 0
5*x^-1 = 1.8 // : 5
x^-1 = 0.36
-1 < 0
1/(x^1) = 0.36 // * x^1
1 = 0.36*x^1 // : 0.36
2.77777778 = x^1
x = 2.77777778
x = 2.77777778
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