(4630-□)/80+372=422.
(4630-□)/80+372=422．
<gadget id="calculator">422 - 372</gadget>
<output>50</output>

<gadget id="calculator">50 * 80</gadget>
<output>4_000</output>

<gadget id="calculator">4_630 - 4_000</gadget>
<output>630</output>

<result>630</result>