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Write the augmented matrix as a system of equations
`OHMaug[(-1,0,2,250),(-3,1,3,200),(-1,1,-2,350)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
-1
0
2
250
-3
1
3
200
-1
1
-2
350