Question 110550
{{{2(y-1)^2=y^2}}}
{{{2(y-1)(y-1)=y^2}}}
{{{2(y^2-2y+1)=y^2}}}
{{{2y^2-4y+4=y^2}}}
{{{y^2-4y+4=0}}}
{{{(y-2)^2=0}}}
So, y=2.