Answer
$$x_1=r, \quad x_2=s , \quad x_3=t, \quad r,s,t \in R.$$
Work Step by Step
The corresponding system is $$0.x_1=0, \quad 0.x_2=0 , \quad 0.x_3=0.$$
Then the solution is
$$x_1=r, \quad x_2=s , \quad x_3=t, \quad r,s,t \in R.$$
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