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12. ( 4a - 3) ( 2a+3)
13. ( 3y + 2) ( 2y-3)
14. ( 5x-2)(x+5)
15. ( 2y -1 )( y+3)
16. (4x-1)(x+3)
17. (3x-2)(2x+3)
18. ( 4a - 5b )( 2a + 3b)
19 . (9m+1)(-2m+1)
20. ( 2x+3)( -x+5 )