add the following .....
4m+5n+7 , -5m-1n-3 and 3m-3n+2
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Answer:
(4m+5n+7)+(-5m-1n-3)+(3m-3n+2)
= (4m-5m+3m)+(5n-1n-3n)+(7-3+2)
= 2m+1n+6
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