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7x / 5 + 7Y / 5 = 210 7(x+y)=5*210 x+y=150 5 / 7X × 0.8 + 5 / 7Y × 0.9 =? 0.56x+0.63y=5? 0.56(x+y)+0.7y=5? 0.56*150+0.7y=5? 0.7y=5?-84
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