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7 8
( 3 4 ) x 3 = ( 9 12) -> 3X
Xt = ( 1 3 )
( 2 4 )
3X - XT = ( 3 6 ) - ( 1 3 ) = ( 2 3 )
( 9 12 ) ( 2 4 ) ( 7 8 )