Solve the equation: 3x/(6/7)=6.
解方程：3x/(6/7)=6．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">6 * (6/7)</gadget>
<output>36/7 = around 5.142857</output>

<gadget id="calculator">(36/7) / 3</gadget>
<output>12/7 = around 1.714286</output>

<result>12/7 = around 1.714286</result>