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Let x be the minimum number of hours the painter must work to earn at least $200.
The painter earns $15 per hour, so his earnings can be represented by the inequality:
15x >= 200
To solve this inequality for x, divide both sides by 15:
x >= 200/15
Simplifying the right side:
x >= 40/3
Since we cannot have a fraction of an hour, we round up to the nearest whole number. The minimum number of hours the painter must work to earn at least $200 is 14 hours.