The number 6 greater than 80% of a number is (66/5). Find this number. (solution by equation)
比一个数的80%大6的数是(66/5)，求这个数．(用方程解)
<gadget id="calculator">66 / 5</gadget>
<output>66/5 = around 13.2</output>

<gadget id="calculator">(66/5) - 6 - 6</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">6 + (6/5)</gadget>
<output>36/5 = around 7.2</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(36/5) / (4/5)</gadget>
<output>9</output>

<result>9</result>