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C = ( 14 x - 39 ) ( 14 x - 39 - 3 )
= ( 14 x - 39 ) ( 14 x - 42 )
= 14 ( 14 x - 39 ) ( x - 3 )
D = ( 9 x - 4 - 11 ) ( 9 x - 4 + 11 )
= ( 9 x - 15 ) ( 9 x + 7 )
E = ( 5 x - 6 ) ( 5 x - 6 - 1 )
= ( 5 x - 6 ) ( 5 x - 5 )
= 5 ( 5 x - 6 ) ( x - 1 )