What is the solution of equation 3.5+4x=16.5 is x=
方程3.5+4x=16.5的解是x=多少
<gadget id="calculator">16.5 - 3.5</gadget>
<output>13</output>

<gadget id="calculator">13 / 4</gadget>
<output>13/4 = around 3.25</output>

<result>13/4 = around 3.25</result>