Interpret complex expressions by treating meaningful sub-expressions as single units.
Rewrite an expression to reveal a meaningful grouped sub-expression
Problem
Rewrite the expression by combining the per-item terms so the total per-item cost before the fixed fee is explicit.
Big Picture
What this problem is really about
Equivalent rewriting can expose which costs repeat and which occur only once. We’ll separate the terms that share the item-count factor from the standalone fee, factor the common count from only those repeated terms, and interpret the grouped coefficients as one combined per-item amount. Distributing back verifies that neither value nor scope changed.
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