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Write the augmented matrix as a system of equations
`[(1,0,-1,350),(0,-8,-3,400),(2,3,-1,300)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
-1
350
0
-8
-3
400
2
3
-1
300