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c in (-oo:+oo)
(2*(8-(4*c)))/7 = 0
(2*(8-4*c))/7 = 0
( 2 )
2 = 0
c belongs to the empty set
( 8-4*c )
8-4*c = 0 // - 8
-4*c = -8 // : -4
c = -8/(-4)
c = 2
c = 2
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