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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-6/x-(8/x)-8 = -5 // + 5
5-6/x-(8/x)-8+5 = 0
5-6/x-8*x^-1-8+5 = 0
-14*x^-1 = -2 // : -14
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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