What is the formula that cannot be used to check 658-469
不能用来验算658-469的算式是多少
<gadget id="calculator">658 - 469</gadget>
<output>189</output>

<gadget id="calculator">658 - 189</gadget>
<output>469</output>

<gadget id="calculator">469 - 469</gadget>
<output>0</output>

<gadget id="calculator">189 + 0 + 189 + 469</gadget>
<output>847</output>

<result>847</result>