(10-x)/2=5x-7．
(10-x)/2=5x-7．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + 5</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">12 / (11/2)</gadget>
<output>24/11 = around 2.181818</output>

<result>24/11 = around 2.181818</result>