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Write the augmented matrix as a system of equations
`[(1,-3,-5,250),(0,1,3,100),(0,0,1,300)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
-3
-5
250
0
1
3
100
0
0
1
300