The school plans to use some money to buy an electronic piano with a unit price of 1050 yuan, which can buy 7 sets. In fact, 3150 yuan was spent on the tape recorder. How many sets can the remaining money be enough to buy?
学校计划用一些钱购买单价1050元得电子琴，正好可以买7台，实际买录音机用去了3150元，剩下的钱还够买几台？
<gadget id="calculator">1_050 * 7</gadget>
<output>7_350</output>

<gadget id="calculator">7_350 - 3_150</gadget>
<output>4_200</output>

<gadget id="calculator">4_200 / 1_050</gadget>
<output>4</output>

<result>4</result>