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Write the augmented matrix as a system of equations
`[(-8,3,3,300),(-4,1,2,200),(-1,0,1,400)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
-8
3
3
300
-4
1
2
200
-1
0
1
400