If 2:3=(5-x):x is known, then what is x equal to
若已知2：3=(5-x)：x，那么x等于多少
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) + 1</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">5 / (5/3)</gadget>
<output>3</output>

<result>3</result>