Let X be the number of marbles I have.

If I give my brother 2 marbles, I'll have X-2 marbles left.

And my brother will have (X-2)/2 marbles.

And my friend will have (X-2)*3 left.

So the total number of marbles is X-2 + (X-2)/2 + (X-2)*3 = 63.

(X-2)*9/2 = 63.

X-2 = 14.

X = <<16=16>>16 marbles.

# Answer

16
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If I give my brother 2 marbles I will have double his number of marbles, but my friend will have triple the number I do. The total number of marbles we have together is 63. How many marbles do I have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
16
If I give my brother 2 marbles I will have double his number of marbles, but my friend will have triple the number I do. The total number of marbles we have together is 63. How many marbles do I have?
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