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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
c/c+120 = 21.7/100 // - 21.7/100
c/c-(21.7/100)+120 = 0
c/c-0.217+120 = 0
120.783 = 0
c belongs to the empty set
c belongs to the empty set
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