For a fraction, the numerator is 3 smaller than the denominator, and the numerator and denominator are added together by 1 to get (2/3), what is the original fraction?
一个分数，分子比分母小3，分子分母同加1后得(2/3)，原分数是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) - 1</gadget>
<output>-1/3 = around -0.333333</output>

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

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/3) / (1/3)</gadget>
<output>5</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">(5/3) / (1/3) / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>