Solve the equation: 4x-5=9.
解方程：4x-5=9．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">14 / 4</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>