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Write the augmented matrix as a system of equations
`[(1,0,0,300),(6,7,-3,100),(-1,-2,1,150)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
0
0
300
6
7
-3
100
-1
-2
1
150