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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2*x)-((6/x)*x)-63 = 0
x-2*x-63-6 = 0
-x-69 = 0 // + 69
-x = 69 // * -1
x = -69
x = -69
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