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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/5 = 10/x // - 10/x
3/5-(10/x) = 0
3/5-10*x^-1 = 0
-10*x^-1 = -3/5 // : -10
x^-1 = 3/50
-1 < 0
1/(x^1) = 3/50 // * x^1
1 = 3/50*x^1 // : 3/50
50/3 = x^1
x = 50/3
x = 50/3
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