What is the solution of 4x+13.5=85.5 x=
4x+13.5=85.5的解是x=多少
<gadget id="calculator">85.5 - 13.5</gadget>
<output>72</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>