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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/2.75 = 1/3.2-(1/x) // - 1/3.2-(1/x)
1/x+1/2.75-(1/3.2) = 0
1/x+1/2.75-0.3125 = 0
1*x^-1 = -0.05113636 // : 1
x^-1 = -0.05113636
-1 < 0
1/(x^1) = -0.05113636 // * x^1
1 = -0.05113636*x^1 // : -0.05113636
-19.55555695 = x^1
x = -19.55555695
x = -19.55555695
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