(8/9)*(3/4)-(7/15)*(5/6).
(8/9)*(3/4)-(7/15)*(5/6)．
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(8/9) * (3/4)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

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

<gadget id="calculator">(7/15) * (5/6)</gadget>
<output>7/18 = around 0.388889</output>

<gadget id="calculator">(2/3) - (7/18)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>