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