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Write the augmented matrix as a system of equations
`[(1,0,0,150),(1,1,0,350),(-1,1,1,300)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
0
150
1
1
0
350
-1
1
1
300