Class 3 and Class 2 newly purchased 68 science and art books, and the number of literature and art books was 7 times less than that of science and technology books. How many new art books have you purchased?
三2班同学新购买科技书和文艺书共68本，文艺书的本书比科技书的4倍少7本．新购买的文艺书是多少本？
<gadget id="calculator">7 + 68</gadget>
<output>75</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 - 7</gadget>
<output>53</output>

<result>53</result>