Zhang Hua bought 2 photo albums and 6 exercise books at the self-selected supermarket, which cost 14.5 yuan in total. A photo album is 5.75 yuan, how much is an exercise book? (Solve by two methods of equation solution and arithmetic method)
张华在自选超市买了2本相册和6本练习本，共用14.5元．一本相册5.75元，一本练习本多少元？(用方程解和算术法两种方法解答)
<gadget id="calculator">5.75 * 2</gadget>
<output>11.5</output>

<gadget id="calculator">14.5 - 11.5</gadget>
<output>3</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>