习近平总书记指出，中华优秀传统文化是中华民族的“根”和“魂”．为了大力弘扬中华优秀传统文化，某校决定开展名著阅读活动．用3600元购买“四大名著”若干套后，发现这批图书满足不了学生的阅读需求，图书管理员在购买第二批时正赶上图书城八折销售该套书，于是用2400元购买的套数只比第一批少4套．设第一批购买的“四大名著”每套的价格为x元，则符合题意的方程是___________________．
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