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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.2/x = 2.75/0.4 // - 2.75/0.4
3.2/x-(2.75/0.4) = 0
3.2/x-6.875 = 0
3.2*x^-1 = 6.875 // : 3.2
x^-1 = 2.1484375
-1 < 0
1/(x^1) = 2.1484375 // * x^1
1 = 2.1484375*x^1 // : 2.1484375
0.46545455 = x^1
x = 0.46545455
x = 0.46545455
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