When Y-X = 5 x ^ 2-y ^ 2 + 5x + 5Y + 2009 =?

When Y-X = 5 x ^ 2-y ^ 2 + 5x + 5Y + 2009 =?

x²-y²+5x+5y+2009=x²-y²+x(y-x)+y(y-x)+2009=x²-y²+xy-x²+y²-xy+2009=2009