If you are asking as a seller if you can walk on an accepted - fully executed with signatures - deal definitely consult an attorney. The offer agreements usually protect the buyer more than the seller and I am pretty sure the seller can't just back out on the deal, meaning you are obligated to sell the property if the buyer pushes. Now there is the small chance the buyer will be ok with your not fulfilling the contractual obligation to sell the property for X price under X terms but you will have to be very careful. i would check your contract with your sellers agent too and see what it says about paying them the commission even if you walk on the deal as depending on the language your agent may have fulfilled his/her side of your agency contract and therefore you owe him/her some type of nominal recourse as well.
Either way consult an attorney as you are dealing with legally binding contracts and if you are going to get out of either situation you want your first attempt to be done the right way because you may only get that one shot.
In most states, your listing contract has terms in it that if the seller finds you a willing buyer and you come to terms on a purchase agreement, but fail to follow through and consumate the transaction for reasons within your control, you're then liable to compensate the listing agent just as if you had sold the home.
That said, if your circumstances are reasonable, unless your listing agent is a real j_rk, they should be willing to work with you to continue to list and sell your property for you. If your circumstances are unreasonable, then I think you should expect the listing agent to pursue getting paid.
If there is more to the story, provide an update through an answer and we can discuss further.
Your post is confusing.
First of all, if you want legal advice , then you need to speak with an attorney experienced in real estate matters.
Second, it sounds as though you are not using professional representation. If this is the case, even more important to talk with an attorney.
If you ARE using a Realtor, then you should pose this question to them.
The truth is that in most cases acceptance can be withdrawn, however, as with most legal matters, there could be money involved (damages), depending on the facts.