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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
90/x-(90/x)-5 = -1/4 // + -1/4
90/x-(90/x)-(-1/4)-5 = 0
90/x-90*x^-1+1/4-5 = 0
-19/4 = 0
x belongs to the empty set
x belongs to the empty set
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