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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/50 = 5.5/x // - 5.5/x
1/50-(5.5/x) = 0
1/50-5.5*x^-1 = 0
-5.5*x^-1 = -1/50 // : -5.5
x^-1 = 0.00363636
-1 < 0
1/(x^1) = 0.00363636 // * x^1
1 = 0.00363636*x^1 // : 0.00363636
275.000275 = x^1
x = 275.000275
x = 275.000275
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