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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.5/x = 1.4 // - 1.4
6.5/x-1.4 = 0
6.5*x^-1 = 1.4 // : 6.5
x^-1 = 0.21538462
-1 < 0
1/(x^1) = 0.21538462 // * x^1
1 = 0.21538462*x^1 // : 0.21538462
4.64285704 = x^1
x = 4.64285704
x = 4.64285704
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