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Write the augmented matrix as a system of equations
`[(1,0,-1,300),(0,1,-2,200),(1,0,0,250)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
-1
300
0
1
-2
200
1
0
0
250