The perimeter of a rectangle is equal to 98 cm. It is known that the length is 9 cm longer than the width. What is the length of the rectangle in cm?
一个长方形的周长等于98厘米，已知长比宽长9厘米，长方形的长是多少厘米？
<gadget id="calculator">98 / 2</gadget>
<output>49</output>

<gadget id="calculator">49 + 9</gadget>
<output>58</output>

<gadget id="calculator">58 / 2</gadget>
<output>29</output>

<result>29</result>