help me please, im stumped

Answer:
answer is 10....that was simple
Step-by-step explanation:
as we know both the Δ were congruent, then CPCT will also be equal
angle b = angle q
that means 3v + 4 = 8v - 6
6 + 4 = 8v - 3v
10 = 5v
10/5 = v = 2
put the value of v = 2 and u'll get 10