If someone could help me with this that would be a big help.

Answer:
x=6 x+3 (6+3)=9
Step-by-step explanation:
The x is 6
6 plus 3 equals 9
(I say it's 6 because if we measure A to B it's 6 which has the same length as the other triangle connected to it.)
~~hope this helps~~~ :)