xy-[yz-zx-{yx-(3y-xz)-(xy-zy)}]
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Answer:
xy-[yz-zx-{yx-(3y-xz)-(xy-zy)}]
=>xy-[yz-zx-(yx-3y+xz-xy+zy}]
=>xy-[yz-zx-yx+3y-zx+xy-zy]
=>xy-zy+zx+yx-3y+xz-xy+zy
=>2zx+xy-3y
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