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c in (-oo:+oo)
(1/6)*(2*c-1) = 0
1/6*(2*c-1) = 0
( 1/6 )
1/6 = 0
c belongs to the empty set
( 2*c-1 )
2*c-1 = 0 // + 1
2*c = 1 // : 2
c = 1/2
c = 1/2
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