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3(2y - 5 ) + (y - 8)(y + 8 )

= 6 y - 15 + y² - 64

= y² + 6 y - 79

(5z - 1 )(z + 2) - (5z - 1)(8 - 3z)

= ( 5 z - 1 ) ( z + 2 - 8 + 3 z )

= ( 5 z - 1 ) ( 4 z - 6 )

= 2 ( 5 z - 1 ) ( 2 z - 3 )

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