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3I ( I - 4m + 5n ) from 4I ( 10n - 3m + 2I )

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3l (l − 4m + 5n) = 3l2 − 12lm + 15ln 

4l (10n − 3m + 2l) = 40ln − 12lm + 8l2

Subtracting these expressions, we obtain

Therefore, the result is 5l2 + 25ln.

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