If 6x-1=3, then 9x+4=how much.
如果6x-1=3，则9x+4=多少．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>