Question

y-[y-(2-y)-1]=-(1-y) como rezolvo

Answer 1

y-[y-2+y-1]= -1+y
y-[2y-3]= -1+y
y-2y+3= -1+y
-y+3=-1+y
-y-y= -3-1
-2y= -4
y= -4/-2= 2