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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/8 = 3/x-6 // - 3/x-6
7/8-(3/x)+6 = 0
7/8-3*x^-1+6 = 0
-3*x^-1 = -55/8 // : -3
x^-1 = 55/24
-1 < 0
1/(x^1) = 55/24 // * x^1
1 = 55/24*x^1 // : 55/24
24/55 = x^1
x = 24/55
x = 24/55
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