(2x-3)/3=7．
(2x-3)/3=7．
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">1 + 7</gadget>
<output>8</output>

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

<gadget id="calculator">8 / (2/3)</gadget>
<output>12</output>

<result>12</result>