f(x,y)=2x^2+y^2 subject to the constraint of x+y=1.

I understand how to set it up and how to find f with respect to x y and L.

fx=4x+L

fy=2y+L

fL=x+y-1

So, again...I understand the cal part of it, but fail to remember the basic allgebra part. Please solve for x, y, and L (ie the critical point)