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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2 = 249/x // - 249/x
1.2-(249/x) = 0
1.2-249*x^-1 = 0
-249*x^-1 = -1.2 // : -249
x^-1 = 0.00481928
-1 < 0
1/(x^1) = 0.00481928 // * x^1
1 = 0.00481928*x^1 // : 0.00481928
207.4998755 = x^1
x = 207.4998755
x = 207.4998755
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