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Write the augmented matrix as a system of equations
`[(7,-9,0,350),(-3,4,0,400),(7,-6,1,200)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
7
-9
0
350
-3
4
0
400
7
-6
1
200