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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.3/x = 1.2/0.8 // - 1.2/0.8
2.3/x-(1.2/0.8) = 0
2.3/x-1.5 = 0
2.3*x^-1 = 1.5 // : 2.3
x^-1 = 0.65217391
-1 < 0
1/(x^1) = 0.65217391 // * x^1
1 = 0.65217391*x^1 // : 0.65217391
1.53333334 = x^1
x = 1.53333334
x = 1.53333334
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