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Answer:
45 + 3m = 75
Step-by-step explanation:
**You haven't provided the options for the solution in your question**
However, from the information provided, the equation representing the situation is:
45 + 3m = 75
To solve 45 + 3m = 75:
Subtract 45 from both sides: 3m = 30
Divide both sides by 3: m = 10
Therefore he solved 10 math problems.