The sum of a number plus (3/4) is 5 (8/15), what is this number?
一个数加(3/4)的和是5的(8/15)，这个数是多少？
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">5 * (8/15)</gadget>
<output>8/3 = around 2.666667</output>

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

<gadget id="calculator">(8/3) - (3/4)</gadget>
<output>23/12 = around 1.916667</output>

<result>23/12 = around 1.916667</result>