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Analog Engineer's Circuit: Amplifiers-----Inverting summer circuit

Other Parts Discussed in Thread: OPA683, OPA684


when i go through the pdf document of Analog Engineer's Circuit: Amplifiers,  i can see the descrpition as below:

can you explain why the first formula is 2.5V-(-2.5V), but the second formula is 250mv-(-250mv) ?

thanks a lot !!