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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/3.6 = 170/x // - 170/x
1/3.6-(170/x) = 0
1/3.6-170*x^-1 = 0
-170*x^-1 = -0.27777778 // : -170
x^-1 = 0.00163399
-1 < 0
1/(x^1) = 0.00163399 // * x^1
1 = 0.00163399*x^1 // : 0.00163399
611.99884944 = x^1
x = 611.99884944
x = 611.99884944
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