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Multiply: {2m+(-n)}b y\ {-3m+"("-5"}"...

Multiply: `{2m+(-n)}b y\ {-3m+"("-5"}"`

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`(2m+(-n))xx(-3m+(-5))`
`(2m-n)xx(-3m-5)`
`-3m(2m-n)-5(2m-n)`
`-6m^2-3mn-10m-5n`
`-6m^2-10m-3mn-5n`
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