Find all sets of four real numbers
![x_1, x_2, x_3, x_4](/media/m/3/c/6/3c6642f88991f08ce0a1ba6359ffb005.png)
such that the sum of any one and the product of the other three is equal to 2.
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Find all sets of four real numbers $x_1, x_2, x_3, x_4$ such that the sum of any one and the product of the other three is equal to 2.