合并同类项 9(X+Y)-2(X+Y)-6(X+Y)=x+Y
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合并同类项 9(X+Y)-2(X+Y)-6(X+Y)=x+Y
合并同类项 9(X+Y)-2(X+Y)-6(X+Y)=x+Y
合并同类项 9(X+Y)-2(X+Y)-6(X+Y)=x+Y
对的
正确
对啊
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