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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-52 = 15/x-2 // - 15/x-2
6/x-(15/x)-52+2 = 0
6/x-15*x^-1-52+2 = 0
-9*x^-1 = 50 // : -9
x^-1 = -50/9
-1 < 0
1/(x^1) = -50/9 // * x^1
1 = -50/9*x^1 // : -50/9
-9/50 = x^1
x = -9/50
x = -9/50
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