Question

arme e efetue as equações de primeiro grau
y-[y-(2-y)-1]=-(1-y)

Answer 1

y-[y-(2-y)-1]=-(1-y)
y-[y-2-y-1]=-1-y
y-[-2y-3]=-1-y
y-2y-3=-1-y
y-3=-1-y
y+y=-1+3
2y=2
y=1