7x+(1/5)=(2/3).
7x+(1/5)=(2/3)．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(7/15) / 7</gadget>
<output>1/15 = around 0.066667</output>

<result>1/15 = around 0.066667</result>