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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.4/x = 4/7 // - 4/7
6.4/x-(4/7) = 0
6.4/x-4/7 = 0
6.4*x^-1 = 4/7 // : 6.4
x^-1 = 0.08928571
-1 < 0
1/(x^1) = 0.08928571 // * x^1
1 = 0.08928571*x^1 // : 0.08928571
11.20000054 = x^1
x = 11.20000054
x = 11.20000054
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