subtract ( L - 4m + 5n ) from ( 10 n - 3m + 21 )
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(10n-3m+21)-(L-4m+5n)
=10n-3m+21-L+4m-5n
=5n+m+21-L
=10n-3m+21-L+4m-5n
=5n+m+21-L
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Hope the answer helps uuuuu
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kiki9876:
Instead of -m it is +m
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