Understanding this circuit with op. amps
I'll let someone else do the sums formally/generally, but there is an easy approach here that will allow you to solve it by inspection. 

As you know, the op-amp inputs are both going to be 0V at balance (if there is negative feedback and the op-amp can balance). So let's assume that. 

That means that 100uA is flowing through R3, and since our ideal op-amp input contributes nothing, 100uA must be flowing out of R2, by KCL. 

So now we know the voltage at the junction of R1/R2/R5- it must be -1V. 

So the current through R1 is 200uA, and the current flowing out through R5 must therefore be 300uA (100uA + 200uA). So the output is 6V below -1V or -7V.  

(scrawl arrows on the schematic to keep the current directions straight, if it helps).