Solve multi-step linear equations, including equations requiring simplification first.
Solve a fixed multi-step context model
Problem
\(\text{Three}~\text{reserved}~\text{sections}\) each have \(x~\text{regular}~\text{seats}\) plus \(2~\text{aisle}~\text{seats}\), and \(6~\text{back}~\text{seats}\) make \(42\) total. Complete and solve: \(3(x~+~2)~+~6~=~42\); \(x~=~\text{\_\_\_}\).
Big Picture
What this problem is really about
Keep the repeated and fixed seat groups distinct. Each of the three sections repeats both its unknown regular seats and two aisle seats, while the six back seats are added only once. Reverse that structure by removing the back seats, dividing among sections, and then removing one section's aisle seats.
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