Find the product of matrices A and B, wh...

Find the product of matrices A and B, where `A= [(-5,1,3),(7,1,-5),(1,-1,1)] and B= [(1,1,2),(3,2,1),(2,1,3)]`. Hence, solve the following equations by matrix method:
`x+y+2z=1, 3x+ 2y + z= 7, 2x+ y + 3z= 2`

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