Your math is off. :wink: You apparently forgot about how R7 and R8 affect the non-inverting gain.
The voltage at the op amp (+) input is 2.5V, multiplied by the gain of the op amp, which is +2 (due to R7 and R8), giving an output of +5V for that input
The +7V at the minus input is multiplied by the op amp gain of -1, giving an output of -7V for that input.
Using superposition, the op amp output is thus -2V, exactly as you simulated.