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Write the augmented matrix as a system of equations
`[(1,0,1,150),(1,1,-1,200),(2,0,3,100)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
1
150
1
1
-1
200
2
0
3
100