The father is 32 years old this year, and the son is 5 years old this year. How many years later will the father's age be exactly twice the son's age?
父亲今年32岁，儿子今年5年，多少年后，父亲年龄刚好是儿子年龄的2倍？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">32 - 5 - 5</gadget>
<output>22</output>

<result>22</result>