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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/8 = 7/x+6 // - 7/x+6
9/8-(7/x)-6 = 0
9/8-7*x^-1-6 = 0
-7*x^-1 = 39/8 // : -7
x^-1 = -39/56
-1 < 0
1/(x^1) = -39/56 // * x^1
1 = -39/56*x^1 // : -39/56
-56/39 = x^1
x = -56/39
x = -56/39
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