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Write the augmented matrix as a system of equations
`[(1,0,0,400),(-2,1,1,150),(-3,0,1,250)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
`[(1,0,0,400),(-2,1,1,150),(-3,0,1,250)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
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