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I assumed kopecks were pennies. If Misha needs one, and Masha doesn't have enough to give her one, than Masha must have none. So the answer follows from that.

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How can they combine their money if one of them doesn't have any?

Communism?

Ok. I literally laughed out loud.

But naturally, at first you assume the numbers are natural. :)

Well, yes, otherwise you'd have an infinite number of solutions.

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