Solve the equation and check: 4x+18=34.
解方程并检验：4x+18=34．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">18 - 18</gadget>
<output>0</output>

<gadget id="calculator">16 + 0</gadget>
<output>16</output>

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

<result>4</result>