Factorise the following.
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(2x +1/3 )²-(x - 1/2)²
= [(2x + 1/3) + ( x - 1/2 ) ][( 2x + 1/3) - (x - 1/2 )]
= [ 2x + 1/3 + x - 1/2 ][ 2x + 1/3 - x + 1/2]
= ( 3x + 1/3 - 1/2) (x +1/3+1/2)
=[(18x + 2 - 3 )/6 ] [( 6x + 2 + 3 )/6]
= (1/36 )( 18x -1) (6x + 5)
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