@softcalculate You know that the (-) input of the opamp should be the same as the voltage at the (+) input. If so, what current would be present in R1 and what direction is the arrow of that current? Whatever you calculate for that must also be the same current (and direction) found in RF. If +5 is on the left of R1 and +3 is on the right of R1, and if the same left-right sign arrangement must be true for RF, what's the magnitude difference across RF and what does that mean for VO?
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