Algebra Foundation Quiz #2 Question 6

I am getting an answer of negative for age which is not possible can someone please share the solution
Akunna is currently twice as old (in years) as Bako. In

4 years, Akunna will be two-thirds older than Bako. What is the sum of their current combined ages?
my two equation are
Akunna is currently twice as old as Bako:

A=2B.
In 4 years, Akunna will be two-thirds older than Bako:
𝐴+4=2/3(𝐵+4)
This gives the answer of B=-1

Did you watch the solution video for the quiz already?