Solve the equation (2.4+x)*2=7.
解方程(2.4+x)*2=7．
<gadget id="calculator">2.4 * 2</gadget>
<output>4.8</output>

<gadget id="calculator">7 - 4.8</gadget>
<output>2.2</output>

<gadget id="calculator">2.2 / 2</gadget>
<output>1.1</output>

<result>1.1</result>