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Subtract: 3l\ (l-4m+5n) from 4l(10 n-3m+...

Subtract: `3l\ (l-4m+5n)` from `4l(10 n-3m+2l)`

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`3l\ (l-4m+5n)` from `4l(10 n-3m+2l)`
`=40ln-12lm+8l^2-3l^2+12lm-15ln`
`=5l^2+25ln`
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