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3mn, -5mn, 8mn , -4mn

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3mn+ (-5mn) + 8mn + (-4mn)
= 3mn - 5mn + 8mn - 4mn
= -2mn + 8mn - 4mn
= 6mn - 4mn
= 2mn

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=3mn+(-5mn)+8mn+(-4mn)
=3mn-5mn+8mn-4mn
=-2mn-4mn
=2mn
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2MN
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