2.24/(0.4-(1/5))-2.24/0.4-(1/5)=
2.24/(0.4-(1/5))-2.24/0.4-(1/5)=
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">0.4 - (1/5)</gadget>
<output>0.2</output>

<gadget id="calculator">2.24 / 0.2</gadget>
<output>11.2</output>

<gadget id="calculator">2.24 / 0.4</gadget>
<output>5.6</output>

<gadget id="calculator">11.2 - 5.6 - (1/5)</gadget>
<output>5.4</output>

<result>5.4</result>