Answer
$$ V=\frac{3s}{2}-\frac{t}{2}.$$
Work Step by Step
We are given:
$$s=\dfrac{2V+t}{3}$$
By multiplying both sides by 3, we get $$3s=2V+t.$$ Now, by dividing both sides by 2 and solving for $V$, we have
$$\frac{3s}{2}=V+\frac{t}{2}\Longrightarrow V=\frac{3s}{2}-\frac{t}{2}.$$
