(15/28)x=(4/5); 8x-(1/3)=(1/9).
(15/28)x=(4/5)；8x-(1/3)=(1/9)．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(4/9) * (1/8)</gadget>
<output>1/18 = around 0.055556</output>

<result>1/18 = around 0.055556</result>