The product of 2 and a number, minus (1/2) is equal to (1/2), what is this number?
2与一个数的积，减去(1/2)的差等于(1/2)，这个数是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + (1/2)</gadget>
<output>1</output>

<result>1/2 = around 0.5</result>