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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
205/x = 5.54 // - 5.54
205/x-5.54 = 0
205*x^-1 = 5.54 // : 205
x^-1 = 0.02702439
-1 < 0
1/(x^1) = 0.02702439 // * x^1
1 = 0.02702439*x^1 // : 0.02702439
37.00361044 = x^1
x = 37.00361044
x = 37.00361044
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