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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
70/x-(70/x)+5 = -1/3 // + -1/3
70/x-(70/x)-(-1/3)+5 = 0
70/x-70*x^-1+1/3+5 = 0
16/3 = 0
x belongs to the empty set
x belongs to the empty set
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