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Write the augmented matrix as a system of equations
`[(1,2,-2,350),(0,1,1,200),(-2,-4,5,300)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
2
-2
350
0
1
1
200
-2
-4
5
300