x-(4/9)-(5/9)x=(2/3).
x-(4/9)-(5/9)x=(2/3)．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

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

<gadget id="calculator">(4/9) + (2/3)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(10/9) / (4/9)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>