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x²+y²+z²=14…①
x=5y-7、z=4y-7…④

(5y-7)²+y²+(4y-7)²=14
→ 25y²-70y+49+y²+16y²-56y+49=14
→ 42y²-126y+84=0
→ y²-3y+2=0

てと

うわもう!ホントにありがとうございます!!!
助かりました😭🙏

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