Calculate op amp gain

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Hello,

So in reference to the attachment below, (Assuming V rails are +/-15Vdc) I know that the output is approximately 0.5Vdc.

So if I move V1 from 2 Vdc to 3 Vdc, my output will then be approximately -1.5Vdc

Ao = deltaVout/deltaVin

Ao = -1.5-0.5/3.0-2.0

Ao = -2.0Vdc/1Vdc

Ao = -2

Is this correct?