Answer: The required equation : [tex]x+6=19[/tex]
There are 13 fishes in small aquarium.
Step-by-step explanation:
Let the number of fishes in small aquarium be x.
Given : A large aquarium has 6 more fish then a small aquarium.
There are 19 fishes in a large aquarium.
Then, the equation to find the number of fishes in small aquarium (x) is given by:_
[tex]x+6=19[/tex]
To solve the above equation, subtract 6 from each sides , we get
[tex]x=13[/tex]
Hence, there are 13 fishes in small aquarium.