The width of a rectangle is 10 centimeters. After its length is reduced by 5 centimeters, the area is 170 square centimeters. What is the original length of the rectangle?
一个长方形的宽是10厘米，它的长减少5厘米后，面积是170平方厘米，这个长方形原来的长是多少．
<gadget id="calculator">170 / 10</gadget>
<output>17</output>

<gadget id="calculator">17 + 5</gadget>
<output>22</output>

<result>22</result>