4xy-9zy+5xy-[6xy-(5zx-3xy)-4yz]
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Answer:
-5z(y-x)
Step-by-step explanation:
=4xy - 9zy +5xy -[6xy -5zx + 3xy -4yz]
= 4xy- 9zy +5xy-6xy +5zx - 3xy + 4yz
= 4xy +5xy - 6xy -3xy -9zy +4yz+5zx
= 9xy -9xy -5yz +5zx
=-5yz+5zx
= -5z(y-x)
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