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Write the augmented matrix as a system of equations
`[(1,0,-1,150),(3,1,-7,350),(-9,-3,22,250)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
-1
150
3
1
-7
350
-9
-3
22
250