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Write the augmented matrix as a system of equations
`[(1,0,0,400),(0,3,-2,150),(0,-1,1,200)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
0
400
0
3
-2
150
0
-1
1
200