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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
191/x = 15/60 // - 15/60
191/x-(15/60) = 0
191/x-1/4 = 0
191*x^-1 = 1/4 // : 191
x^-1 = 1/764
-1 < 0
1/(x^1) = 1/764 // * x^1
1 = 1/764*x^1 // : 1/764
764 = x^1
x = 764
x = 764
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