fraction in the simplest form, if 1 is subtracted from the numerator, it will be (1/2) after simplification; if 5 is added to the denominator, it will also be (1/3) after simplification; what is this fraction.
一个最简分数，如果分子减去1，化简后是(1/2)；如果分母加上5，化简后也是(1/3)；这个分数是多少．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">3 / 1 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>