Solve the equation; (3/5): (2/5)x=(5/4): (5/9).
解方程；(3/5)：(2/5)x=(5/4)：(5/9)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 2</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>