(7050-□)/(231-156)=25, how much should be filled in □.
(7050-□)/(231-156)=25，□应填多少．
<gadget id="calculator">231 - 156</gadget>
<output>75</output>

<gadget id="calculator">25 * 75</gadget>
<output>1_875</output>

<gadget id="calculator">7_050 - 1_875</gadget>
<output>5_175</output>

<result>5_175</result>