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= 4y ( 2y - 1 ) - 5 ( 2y - 1 )
= ( 4y - 5 ) ( 2y - 1)
b. - 7x -20 = - 15x + 8x - 20
=3x ( 2x - 5 ) + 4 ( 2x - 5 )
= ( 3x + 4 ) ( 2x - 5 )