2 times a number plus the product of 1.2 and 1.5, the sum is 13.4, what is this number? (column equation solving)
一个数的2倍加上1.2与1.5的积，和是13.4，这个数是多少？(列方程求解)
<gadget id="calculator">1.2 * 1.5</gadget>
<output>1.8</output>

<gadget id="calculator">13.4 - 1.8</gadget>
<output>11.6</output>

<gadget id="calculator">11.6 / 2</gadget>
<output>5.8</output>

<result>5.8</result>