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y-4x/5=4 득 y=4+4x/5 x+y=58 대 입, 득 4+9x/5=58 즉 9x/5=54 풀다 대 입 x+y=58,득 y=28 그래서 방정식 조 의 해 는 x=30,y=28 이다.
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