A number (3/5) plus 7 (1/14), the sum is (17/20), find this number.
一个数的(3/5)加上7个(1/14)，和是(17/20)，求这个数．
<gadget id="calculator">17 / 20</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(1/14) * 7</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(17/20) - (1/2)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/20) / (3/5)</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>