Author note — to cover

Solve equations with the unknown on both sides, e.g. 5x − 3 = 2x + 9, collecting unknowns onto the side that keeps the coefficient positive; include traps like 12 − x = 3x + 2 and non-integer answers. Expanding brackets first belongs with the sibling page. Both tiers. (A17)

• Fluency — direct questions on unknowns on both sides, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).