calculating unit-pulse responses for discrete-time systems

My teacher hasn't exactly explained anything of how to compute the values of h[n] in discrete-time systems. The problem is y[n+1]+y[n]=2x[n] and I know that yousubstitute n for n+1 and y for h and delta(&) for x making the problem h[n]=-h[n-1]+2&[n-1]. My question is how do you calculate the values when youimplement n=0,1,2,3? for instance what would be the value if n=2 —> h[2]= -h[1]+2&[1] of -h[1]? is there a general formula to follow to compute the latterh[n] values?
thank you


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