Steps:
Step 1:) Combine like terms to get the equation to be [tex] y=(2x^{2} -8x)-y [/tex]
(PS You can remove parentheses after this step)
Step 2:)Add y to both sides
Step 3:)Simplify
Set 4:) for divide both sides by 2
Your final simplified answer would be y=x(x-4)