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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = 8/x-10 // - 8/x-10
Y-(8/x)+10 = 0
Y-8*x^-1+10 = 0
-8*x^-1 = -(Y+10) // : -8
x^-1 = (Y+10)/8
-1 < 0
1/(x^1) = (Y+10)/8 // * x^1
1 = x^1*((Y+10)/8) // : (Y+10)/8
8*(Y+10)^-1 = x^1
x = 8*(Y+10)^-1
x = 8*(Y+10)^-1
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