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Write the augmented matrix as a system of equations
`OHMaug[(3,9,-2,350),(0,1,1,400),(-10,-30,7,100)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
3
9
-2
350
0
1
1
400
-10
-30
7
100