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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x+5/6 = -2/x // + -2/x
8/x-(-2/x)+5/6 = 0
8/x+2*x^-1+5/6 = 0
10*x^-1 = -5/6 // : 10
x^-1 = -1/12
-1 < 0
1/(x^1) = -1/12 // * x^1
1 = -1/12*x^1 // : -1/12
-12 = x^1
x = -12
x = -12
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