4-(8/15)/(2/3)-(1/5).
4-(8/15)/(2/3)-(1/5)．
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

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

<gadget id="calculator">(8/15) / (2/3)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">4 - (4/5) - (1/5)</gadget>
<output>3</output>

<result>3</result>