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D( x )
120*x-88 = 0
120*x-88 = 0
120*x-88 = 0
120*x-88 = 0 // + 88
120*x = 88 // : 120
x = 88/120
x = 11/15
x in (-oo:11/15) U (11/15:+oo)
5/(120*x-88) = 0
5 = 0
x belongs to the empty set
x belongs to the empty set
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