((5x-1)/6)=(3/7).
((5x-1)/6)=(3/7)．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/6) + (3/7)</gadget>
<output>25/42 = around 0.595238</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(25/42) / (5/6)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>