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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.125/x = 6 // - 6
8.125/x-6 = 0
8.125*x^-1 = 6 // : 8.125
x^-1 = 0.73846154
-1 < 0
1/(x^1) = 0.73846154 // * x^1
1 = 0.73846154*x^1 // : 0.73846154
1.35416666 = x^1
x = 1.35416666
x = 1.35416666
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