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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
312/(-x) = -104 // + 104
312/(-x)+104 = 0
-312*x^-1 = -104 // : -312
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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