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c in (-oo:+oo)
(1/4)*(8-(20*c))+3*(2*c-5)-c-5 = 0
(1/4)*(8-20*c)+3*(2*c-5)-c-5 = 0
1/4*(8-20*c)+3*(2*c-5)-c-5 = 0
1/4*(8-20*c)+3*(2*c-5)-c-5 = 0
c-c-13-5 = 0
-13-5 = 0
-18 = 0
-18 = 0
c belongs to the empty set
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