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If A={:[(1,2,x),(0,1,0),(0,0,1)]:}, B={:...

If `A={:[(1,2,x),(0,1,0),(0,0,1)]:},` `B={:[(1,-2,y),(0,1,0),(0,0,1)]:}` and `AB=I_(3)`, then find the value of x + y + 1.

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