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I do not know of any website that publishes explanations, but I can suggest this to you:
1) Confident of working, got the answer right --> No problem then
2) Confident of working, got it wrong --> Post the question here along with your working for disucssion. I'm sure members will help to point out the error in your working.
3) Guessed on the answer and got it right --> Definitely post the question here and let other members work on it.
4) Answer is wrong --> Post the question here too for discussion.