Use distributive law.
(2n - 9) - 5(-2.4n + 4) = 2n - 9 + 12n - 20
Combine like terms.
(2n - 9) - 5(-2.4n + 4) = 2n + 12n - 9 - 20
Add like terms.
(2n - 9) - 5(-2.4n + 4) = 14n - 29
Hence, the answer is 14n - 29.
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