(2x²-5xy-9y2)-(3y²-9yz+z²)
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(2x²-5xy-9y2)- (3y²-9yz +z²)
9y2-9yz =y2+yz= 2yz
2x²-+z2 =8xz
5xy-3y²=4xy
2yz-8xz+4xy
9xyz
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