The sum of a number and (3/4) minus (5/8), the difference is (1/2), find this number.
一个数与(3/4)的和减去(5/8)，差是(1/2)，求这个数．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/2) - (3/4)</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(5/8) + (-1/4)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>