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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
160/x = 300/650 // - 300/650
160/x-(300/650) = 0
160/x-6/13 = 0
160*x^-1 = 6/13 // : 160
x^-1 = 3/1040
-1 < 0
1/(x^1) = 3/1040 // * x^1
1 = 3/1040*x^1 // : 3/1040
1040/3 = x^1
x = 1040/3
x = 1040/3
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