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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x+6/x+8 = 5 // - 5
7/x+6/x-5+8 = 0
13*x^-1 = -3 // : 13
x^-1 = -3/13
-1 < 0
1/(x^1) = -3/13 // * x^1
1 = -3/13*x^1 // : -3/13
-13/3 = x^1
x = -13/3
x = -13/3
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