A certain bookstore has a 10% discount on all books. Wang Jun bought an "Encyclopedia", which is 6 yuan cheaper than the original price. How much is the original price of this book?
某书店图书一律九折优惠，王军买了一本《百科全书》，比原价便宜6元，这本书原价多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">12 / (1/10)</gadget>
<output>120</output>

<result>120</result>