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4c +5
4c +5
20c+20c = 40c
(4c+5)(4c+5) =0
4c +5 = 0
4c = -5
c = -5/4
CS = (-5/4)
4c +6
4c +6
24c + 24c = 48c
(4c+6)(4c+6) = 0
4c+6 = 0
4c = -6
c = -6/4
c = -2/3
CS= (-2/3)