In a division formula, the remainder is 7, the divisor is 9, the quotient is 31, what is the dividend.
一道除法算式中，余数是7，除数是9，商是31，被除数是多少．
<gadget id="calculator">31 * 9</gadget>
<output>279</output>

<gadget id="calculator">279 + 7</gadget>
<output>286</output>

<result>286</result>