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Suppose A=[{:(2,2,-4),(-4,2,-4),(2,-1,5...

Suppose `A=[{:(2,2,-4),(-4,2,-4),(2,-1,5):}]and B=[{:(1,-1,0),(2,3,4),(0,1,2):}]` then find BA and use these to solve the system of equations
`y+2x=7`
`x-y=3`
`2x+3y+4z=17`

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7
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