to annonymus can you help me with math

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How do i solve inequalitites with three variables. I still can't figure it outplease help.

x+y=1
y-z=-3
2x+3y+z=1


the answers are 3,-2,1 how do get there by solving linear equations with three variables.


5x-2y-z=2
-y+2z=11
x+y+z=-3

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