There is a natural number, if you divide 63, 90, and 130 by it, there will be a remainder, and the sum of the three remainders is 25. What is the smallest of the three remainders?
有一个自然数，用它分别去除63，90，130都有余数，三个余数的和是25．这三个余数中最小的一个是多少．
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