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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+8/x+5 = 3 // - 3
6/x+8/x-3+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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