Solution ratio: (x-1): (62-x-7)=2:7.
解比例：(x-1)：(62-x-7)=2：7．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/7) * 62</gadget>
<output>124/7 = around 17.714286</output>

<gadget id="calculator">(2/7) * 7</gadget>
<output>2</output>

<gadget id="calculator">(124/7) - 2</gadget>
<output>110/7 = around 15.714286</output>

<gadget id="calculator">1 + (110/7)</gadget>
<output>117/7 = around 16.714286</output>

<gadget id="calculator">1 + (2/7)</gadget>
<output>9/7 = around 1.285714</output>

<gadget id="calculator">(117/7) / (9/7)</gadget>
<output>13</output>

<result>13</result>