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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x+6/x+9 = 5 // - 5
8/x+6/x-5+9 = 0
14*x^-1 = -4 // : 14
x^-1 = -2/7
-1 < 0
1/(x^1) = -2/7 // * x^1
1 = -2/7*x^1 // : -2/7
-7/2 = x^1
x = -7/2
x = -7/2
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