During the Children's Day, Mr. Zhang bought a pen for 216 yuan to reward outstanding teenagers. If each pen was 1 yuan cheaper, he could sell 3 more pens. Q: How much is the original price of each pen?
六一节时，张老师用216元买一种钢笔来奖给优秀少年，如果每支钢笔便宜1元钱，那么他就能多卖3支．问：每支钢笔的原价是多少元．
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