Twice a number is 5.4 more than half of this number. Find this number. (solution by equation)
一个数的2倍比这个数的一半多5.4，求这个数．(用方程解)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 - (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">5.4 / (3/2)</gadget>
<output>3.6</output>

<result>3.6</result>