(5m²n + 8mn - 11mn²) + (7n²m - 9mn + 13nm²)
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Answer:
18 m^2 n - mn - 4 mn^ 2
Step-by-step explanation:
Step 1. Make the variables same
mn ^ 2 = n^2 m
Step 2. Remove the brackets by multiple plus with the brackets
Solve according to the signs of similar variables
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