There is a five-digit number. If the ones digit 7 is moved to the tens of thousands digit, the order of the other four digits remains unchanged. The new five-digit number obtained is 8160 times larger than the original number. Find the original number. (solution by equation)
有一个五位数，如果把个位数字7移到万位，其他四个数字顺序不变，得到的新五位数比原数的2倍还大8160，求原数．(用方程解)
<result>32_547</result>