Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Micah has 7 fish in his aquarium. Kenneth has three times as many fish in his aquarium and Matthias has 15 less fish than Kenneth in his aquarium. How many fish do the boys have in total?

### Response:
Kenneth has 7 x 3 = <<7*3=21>>21 fish.
Matthias has 21 - 15 = <<21-15=6>>6 fish.
The boys total had 7 + 21 + 6 = <<7+21+6=34>>34 fish.
#### 34