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c in (-oo:+oo)
(1/5)*c-((1/5)*c)+4 = -9 // + 9
(1/5)*c-((1/5)*c)+4+9 = 0
(1/5)*c+(-1/5)*c+4+9 = 0
13 = 0
c belongs to the empty set
c belongs to the empty set
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