15x-5-2x=43．
15x-5-2x=43．
<gadget id="calculator">5 + 43</gadget>
<output>48</output>

<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<gadget id="calculator">48 / 13</gadget>
<output>48/13 = around 3.692308</output>

<result>48/13 = around 3.692308</result>