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Write the augmented matrix as a system of equations
`OHMaug[(1,-2,6,150),(2,-3,9,350),(4,-6,19,300)]`
`x` + `y` + `z =`
`x` + `y` + `z =`
`x` + `y` + `z =`
1
-2
6
150
2
-3
9
350
4
-6
19
300