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1行目から2行目への変形が間違ってます。
x^2=-x^2+4x は
2x^2-4x=0
x^2-2x=0
x(x-2)=0
x=0、2 です。

あぶりしめさば

そこが違ったんですね。解けました!ありがとうございます

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