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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
32/325 = 18/x // - 18/x
32/325-(18/x) = 0
32/325-18*x^-1 = 0
-18*x^-1 = -32/325 // : -18
x^-1 = 16/2925
-1 < 0
1/(x^1) = 16/2925 // * x^1
1 = 16/2925*x^1 // : 16/2925
2925/16 = x^1
x = 2925/16
x = 2925/16
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