Lena claims \(n~=~3\) satisfies \(4n~=~16\) and checks it by calculating \(4~+~3\). Evaluate \(\text{both}\) her substitution operation and claim, then solve the equation. Report valid or invalid followed by the actual solution.

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valid; n = 3

invalid; n = 3

invalid; n = 4

valid; n = 4

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