Subtract :- 3l(l-4m+5n) from 4l(10n-3m+2l)
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3l(l - 4m + 5n) from 4l(10n - 3m + 2l)
= [4l(10n - 3m + 2l)] - [3l(l - 4m + 5n)]
= [40ln - 12lm + 8l^2] - [3l^2 - 12lm + 15ln]
= 40ln - 12lm + 8l^2 - 3l^2 + 121lm - 15ln
= 40ln - 15ln - 12lm + 12lm + 8l^2 - 3l^2
= 25ln + 5l^2
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