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