(8/15)*((5/6)/((7/9)-(2/3))).
(8/15)*((5/6)/((7/9)-(2/3)))．
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

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

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

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

<gadget id="calculator">(7/9) - (2/3)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(5/6) / (1/9)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(8/15) * (15/2)</gadget>
<output>4</output>

<result>4</result>