Master Zhang processes one part. After working for 4 hours, he has processed 15 more parts than half of the total, and there are still 26 unprocessed parts. How many parts does Master Zhang process per hour on average?
张师傅加工一个零件，工作了4小时，已经比总数的一半多加工15个，还剩下26个未加工，张师傅平均每小时加工零件多少个？
<gadget id="calculator">26 + 15 + 15</gadget>
<output>56</output>

<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<result>14</result>