2y-3)(3y+1)+2(y-5)(y+5)=2(1-2y)²+6y
6y^2+2y-9y-3+2(y^2+5y-5y-25)=2(1-4y+4y^2)+6y
6y^2-7y-3+2y^2-50
=2-8y+8y^2+6y
8y^2-8y^2-55=5y
-55=5y
y=-11
