Chapter 7 of the Jiuzhang suanshu presents a problem of two linear equations involving acres of land and their respective prices. One of the two equations can be translated to: 300x + 300 x plus StartFraction 500 over 7 EndFraction left-parenthesis 87.5 right-parenthesis equals 10,000. y = 10000 If y = 87.5, what is the value for x? 300x + 300 x plus StartFraction 500 over 7 EndFraction y equals 10,000. y = 10,000 300x + 300 x plus StartFraction 500 Over 7 EndFraction y equals 10,000. (87.5) = 10,000 300x + 6,250 = 10,000 x =
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