Starlight Tree Farm sells Douglas firs and Noble firs. One December they sold 139 more Douglas firs than Noble firs. The total number of trees sold was 377. Which equation could be used to solve for n, the number of Noble fir trees sold?
2n - 139 = 377
n - 139 = 377
n + 139 = 377
2n + 139 = 377
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