Solve the equation: (5/8)x: (2/5)=((15/16)x+1):(8/9).
解方程：(5/8)x：(2/5)=((15/16)x+1)：(8/9)．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(5/8) * (8/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">15 / 16</gadget>
<output>15/16 = around 0.9375</output>

<gadget id="calculator">(2/5) * (15/16)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/9) - (3/8)</gadget>
<output>13/72 = around 0.180556</output>

<gadget id="calculator">(2/5) / (13/72)</gadget>
<output>144/65 = around 2.215385</output>

<result>144/65 = around 2.215385</result>