A piece of rope, cut off half of it, less than 2 decimeters, leaving 15 decimeters. How many decimeters was this rope originally?
一根绳子，剪去一半少2分米，还剩下15分米．这根绳子原来长多少分米？
<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<result>26</result>