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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
315/x = 4/16 // - 4/16
315/x-(4/16) = 0
315/x-1/4 = 0
315*x^-1 = 1/4 // : 315
x^-1 = 1/1260
-1 < 0
1/(x^1) = 1/1260 // * x^1
1 = 1/1260*x^1 // : 1/1260
1260 = x^1
x = 1260
x = 1260
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