The difference between 3 times x minus x is 26.6, find the value of x.
x的3倍减去x的差是26.6，求x的值．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">26.6 / 2</gadget>
<output>13.3</output>

<result>13.3</result>