The sum of two addends is 12 greater than one addend and 17 greater than the other addend. What is the sum of these two addends?
两个加数的和比一个加数大12，比另一个加数大17，这两个加数的和是多少．
<gadget id="calculator">17 + 12</gadget>
<output>29</output>

<result>29</result>