464-545+836-455．
464-545+836-455．
<gadget id="calculator">464 - 545</gadget>
<output>-81</output>

<gadget id="calculator">836 - 455</gadget>
<output>381</output>

<gadget id="calculator">(-81) + 381</gadget>
<output>300</output>

<result>300</result>