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(4y+2x)/xy=3 ①
(3y-4x)/xy=5 ②
①を2倍すると
(8y+4x)xy=6 ③
②+③
11y/xy=11
x=1
①に代入すると4y+2=3y
y=-2
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![中学3年2次方程式の問題です。
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基本的なところは省略しました。