2 times of x is 9 more than half of 36, find x. (column equation solution)
x的2倍比36的一半多9，求x．(列方程解答)
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 + 9</gadget>
<output>27</output>

<gadget id="calculator">27 / 2</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>