Question

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

Answer 1

y-[y-(2-y)-1]=-(1-y)
y-[y-2+y-1]=-1+y
y-y+2-y+1=-1+y
y-y-y-y=-1-1-2
y-3y=-4
-2y=-4.(-1)
2y=4
y=4/2
y=2