Solve the equation: 3x-6*7=6.
解方程：3x-6*7=6．
<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">6 + 42</gadget>
<output>48</output>

<gadget id="calculator">48 / 3</gadget>
<output>16</output>

<result>16</result>