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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/6 = 10/x+3 // - 10/x+3
5/6-(10/x)-3 = 0
5/6-10*x^-1-3 = 0
-10*x^-1 = 13/6 // : -10
x^-1 = -13/60
-1 < 0
1/(x^1) = -13/60 // * x^1
1 = -13/60*x^1 // : -13/60
-60/13 = x^1
x = -60/13
x = -60/13
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