(6/7)-(5/6)+(2/3).
(6/7)-(5/6)+(2/3)．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

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

<gadget id="calculator">(6/7) - (5/6)</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/42) + (2/3)</gadget>
<output>29/42 = around 0.690476</output>

<result>29/42 = around 0.690476</result>