double closing question

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Hi guys, i'm a newbie to this and have a potential deal and was wondering how a double close works if i choose to do this over just assigning the contract, I have a house that i am set to sign on that is 30,000 and if I sell for say 50,000 and do a double close would I have to come up with the 30,000 to do the other deal or is there a way around it so that I don't have to come up with the money because as it stands I don't think i'll be abel to but I think there is alot of potential to sell this property for more than just a 3 or 5,000 assignment fee, any help would be greatly appreciated, thanks

Brad