I represented the algebraic structure accurately, kept each transformation valid and checked the result by substitution, graph or equivalent reasoning.
Even Better If (EBI)
I will show the missing inverse operation or algebraic step, keep signs and brackets accurate and test the result in the original relationship.
Stretch and deep challenge
Stretch: Solve 3x²−15x=0 and check both solutions.
Deep challenge: Solve x+y=11 and 2x−y=4, then show both checks.