For a simple fraction, if the numerator is added by 1, the numerator is 2 less than the denominator; if the denominator is added by 1, the fraction value is equal to (3/5), what is the original fraction.
一个最简分数，如果分子加1，分子则比分母少2；如果分母加1，则分数值等于(3/5)，原分数是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 2</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(3/5) + (6/5) + (3/5)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(12/5) / (2/5)</gadget>
<output>6</output>

<gadget id="calculator">6 + 1 + 2</gadget>
<output>9</output>

<gadget id="calculator">(12/5) / (2/5) / 9</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>