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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
267/300 = 163.6/x // - 163.6/x
267/300-(163.6/x) = 0
267/300-163.6*x^-1 = 0
-163.6*x^-1 = -89/100 // : -163.6
x^-1 = 0.0054401
-1 < 0
1/(x^1) = 0.0054401 // * x^1
1 = 0.0054401*x^1 // : 0.0054401
183.82015036 = x^1
x = 183.82015036
x = 183.82015036
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