Solve the equation: (8+x)*4=48.
解方程：(8+x)*4=48．
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">48 - 32</gadget>
<output>16</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>