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2y+2z=4x・・・①
2z+2x=4y・・・②
① - ②から 2y-2x=4x-4y

6y=6x
y=x

②③と①③の組み合わせも計算したら同じようになってx=y=zになると思います

isu

ありがとうございます!
やってみます‼︎

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