The ratio of two numbers is 5 : 7 and their LCM is 105. If X is the ratio of sum of the numbers and difference of the numbers. What is the value of X?

The ratio of two numbers is 5 : 7 and their LCM is 105. If X is the ratio of sum of the numbers and difference of the numbers. What is the value of X?
1). 18
2). 21
3). 6
4). 12

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