The first op amp's output is 18 V and second's output is 27 V but when I sum those two outputs with a summing op amp, it gives -8.53 V at output. What is the wrong with my circuit? Am I not supposed to read "45 V" at output?
R1 = 1k, R2 = 1k, (non-inverting amplifier)
R3 = 2k, R4 = 1k, (non-inverting amplifier)
R5 = 1k, R6 = 1k, R7=1K (adder)