After a certain number is enlarged by 7 times, then reduced by 2 times, plus 8 and minus 6, it is equal to 51, how to find a certain number?
某数扩大7倍后，再缩小2倍，加上8减去6，等于51，求某数？
<gadget id="calculator">6 - 8</gadget>
<output>-2</output>

<gadget id="calculator">51 + (-2)</gadget>
<output>49</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">49 * (2/7)</gadget>
<output>14</output>

<result>14</result>