excel - Sales at X month using Dax -


i have dax formula work out sales amount @ month x works out in 2 stages

cumulative 

cumulativsalesx:=calculate(sum('all'[invoice amount]), datesinperiod(calendar[date], lastdate(calendar[date]),-x,month))   cumulativsalesx+1:=calculate(sum('all'[invoice amount ]), datesinperiod(calendar[date], lastdate(calendar[date]),-x+1,month))

then use difference calculate sales in x month 

salesx =  cumulativsalesx - cumulativsalesx+1

is there more efficient way of doing ?

thank b.


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