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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
130/x-(130/x)-5 = -1/6 // + -1/6
130/x-(130/x)-(-1/6)-5 = 0
130/x-130*x^-1+1/6-5 = 0
-29/6 = 0
x belongs to the empty set
x belongs to the empty set
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