{(2x+4)^2=3y
{(4x+2)^2=3y
{2x+4)^2=(4x+2)^2
{3y=3y
4x^2+16x+16=16x^2+16x+4
-12x^2+12=0
x^2-12=0
(x+1)(x-1)=0
x+1=0 => x₁=-1
x-1=0 => x₂=1
3y=(2*(-1)+4)^2=(4*(-1)+2)^2
3y=4 => y₁=4/3=1 1/3
3y=(2*1+4)^2=(4*1+2)^2
3y=36 => y₂=12
x₁=-1; y₁=1 1/3
x₂=1; y₂=12