Add: -7mn + 5, 12mn + 2, 9mn - 8, -2mn - 3

(-7mn + 5) + (12mn + 2) + (9mn - 8) + (-2mn - 3)

= -7mn + 5 + 12mn + 2 + 9mn - 8 − 2mn - 3

= -7mn + 12mn + 9mn - 2mn + 5 + 2 - 8 - 3

= mn (-7 + 12 + 9 - 2) + (5 + 2 - 8 - 3)

= 12mn - 4

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Add: 5m - 7n, 3n - 4m + 2, 2m - 3mn - 5

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Add the following algebraic expression:

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