0.5y-1-(2y+4)=y

[latex]0.5y-1-(2y+4)=y[/latex] [latex]5y-10-20y-40 = 10y[/latex] [latex]-50 = 25y[/latex] [latex]y = -2[/latex]

0.5y-1-2y-4-y=0 -2,5y=5 y=-2