9 times a number plus 4 minus 12 multiplied by 3 is 57. Find this number?
一个数的9倍加上4减去12乘以3得57，求这个数？
<gadget id="calculator">57 / 3</gadget>
<output>19</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">19 + 8</gadget>
<output>27</output>

<gadget id="calculator">27 / 9</gadget>
<output>3</output>

<result>3</result>