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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 1.25 // - 1.25
8/x-1.25 = 0
8*x^-1 = 1.25 // : 8
x^-1 = 0.15625
-1 < 0
1/(x^1) = 0.15625 // * x^1
1 = 0.15625*x^1 // : 0.15625
6.4 = x^1
x = 6.4
x = 6.4
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