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Update
http://www.tf2outpost.com/trade/23742129 - Sold with a Dead Presidents Hetman's Headpiece (9.5 keys) for a Cloud 9 Metal Slug (18 keys).
(x+9.5)*0.9=18
18/0.9-9.5=10.5
C9 Metal slug is outdated and needs a mini, also 18 *0.9 = 16.2 - 9.5 = 7 keys
Your math is off. If overpay were to be applied to the hetman's, the sale would be 9.5.
And if you were to apply overpay on the slug as well, it would be 7.5, which is too low.
edit: lol didn't notice the slug was outdated, well this sale would be better used to update that instead so I would deem it as invalid.