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Answer:
-1/8 m^3 +7
Explanation:
The only like terms are 3/8m^3 and -1/2m^3. Adding their coefficients, you get ...
(3/8 -1/2)m^3 = (3-4)/8m^3 = -1/8m^3
Then the simplified expression is ...
-1/8m^3 +7
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