Mai earns $7 per hour mowing her neighbors' lawns. She also earned $14 for hauling away bags of recyclables for some neighbors.
To find out how much Mai earned in total, we need to add her earnings from mowing lawns and hauling recyclables.
Since Mai earned $7 per hour mowing the lawns, the total amount she earned from mowing lawns can be found by multiplying $7 by the number of hours she worked mowing lawns.
If the number of hours she worked mowing lawns is 'x', then the amount she earned from mowing lawns is 7*x dollars.
Since Mai earned $14 for hauling recyclables, she earned a total of 7*x + $14 = $21. Answer: \boxed{21}.