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R = 3 ( 2 x - 3 ) / ( x - 4 ) ( 2 x - 3)  - 4 ( x - 4 ) / ( x - 4 ) ( 2 x - 3 )

R =  6 x - 9 / ( x - 4 ) ( 2 x - 3 ) -  ( 4 x - 16 ) / ( x - 4 ) ( 2 x - 3)

R = (  6 x - 9 - 4 x + 16 ) / (  x - 4 ) ( 2 x - 3 )

R =   2 x + 7 / ( x - 4 ) ( 2 x - 3 )

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