x²-[xy + yz + 2xy + {yz - 2x² - (3yz + 3x² + xy)}]
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x²-[xy+yz+2xy+{yz-2x²-(3yz+3x²+xy)}]
x²-[xy+yz+2xy+{yz-2x²-3yz-3x²-xy}]
x²-[xy+yz+2xy+yz-2x²-3yz-3x²-xy]
x²-[2xy-yz-5x²]
x²-2xy+yz+5x²
6x²-2xy+yz
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