Is it possible to have random number chain relation?

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The real problem is like this.There are two equations executing in parallel. Can anybody help ?

Ex: There are four random numbers 5 7 2 and 4. These numbers are related through a chain of relations and a initial value I=20. Scenario is to create a chain of mathematical relation of these random numbers and output as a response. On retrieval, one should get all these numbers.

1> Calculation:

Step1:20 + 5 = 25 20 - 5 = 15

Step2:25 + 7 = 32 15 - 7 = 8

Step3:32 + 2 = 34 8 - 2 = 6

Step4:34 + 4 = 38 6 - 4 = 2

Last numbers 38 and 2 are given.

2> Retrieval(Should get all the values 4,2,7,5): We have known only 38 and 2 as a result from Calculation step. problem is having 38 and 2, possible to get 34 and 6 ? How to solve the following formula and get exact value of x and y?

x + a = 38

y - a = 2