when 3,5,14 are added to a number,then the twice of the sum

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when 3,5,14 are added to a number,then the twice of the sum of first and third number is lager than second number by121.find the number.

有一个数,分别与3、5、14相加,它与第一个数相加的和加上与第三个数相加的和,所得的结果的二倍比它与第二个数相加的和大121.请找到这个数.
设所求的数为x
(3+x)*2+(14+x)*2-(5+x)=121
x=50
希望我翻译的是对的哈~

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