A multiplication formula of two digits multiplied by two digits, one of the multipliers is 29, if the product of the two multipliers and the multiplication is added, 839 is obtained. What's the other multiplier?
一道两位数乘两位数的乘法算式，其中一个乘数是29，如果把两个乘数和乘得的积相加得839．另一个乘数是多少？
<gadget id="calculator">839 - 29</gadget>
<output>810</output>

<gadget id="calculator">29 + 1</gadget>
<output>30</output>

<gadget id="calculator">810 / 30</gadget>
<output>27</output>

<result>27</result>