Simplify \(5x~+~2y~-~3~+~4x~-~y~+~7\). Which \(\text{first}~\text{move}\) combines like terms correctly? Choose it, then simplify the entire expression.
A. Group \(5x\) and \(4x\).
B. Combine \(2y\) and \(-3\).
C. Combine \(5x\) and \(2y\).
What this problem is really about
Treat each proposed first move as a claim about structure: terms belong together only when their variable parts match exactly. Once a valid grouping is identified, reorganize the entire expression into separate x-term, y-term, and constant groups while keeping every sign attached. Simplifying within those groups preserves the expression's value.