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Write the augmented matrix as a system of equations
`[(-1,1,2,200),(0,1,0,250),(-1,0,1,300)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
-1
1
2
200
0
1
0
250
-1
0
1
300