Write an equation to represent the following word problem. Use x as the variable and do not simplify.

Chloe has twice as many cats as her sister has dogs. Her brother has two turtles. Together, they have twelve pets. Write an equation that can be used to find how many of each pet they have.

Let x represent the number of dogs Chloe's sister has.

Since Chloe has twice as many cats as her sister has dogs, Chloe has 2x cats.

Her brother has two turtles.

Together, they have twelve pets.

So, the equation that can be used to find how many of each pet they have is:

x + 2x + 2 = 12