1.

Add(c) -7mn + 7, 12mn - 5,4mn + 7, --2mn - 5​

Answer» ONG>Answer:

21mn+4

Step-by-step EXPLANATION:

7mn + 7 + 12mn - 5 + 4mn + 7 - 2mn - 5 \\ 7mn + 12mn + 4mn - 2mn + 7 - 5 + 7 - 5 \\ 23mn - 2mn + 2 + 2 \\  = 21mn + 4



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