Consider the following relationships between vectors $\displaystyle u$, $\displaystyle v$ and $\displaystyle w$.

i) $\displaystyle u = 2v + w$

ii) $\displaystyle w = v - u$

Which of the following statements is true?

A) $\displaystyle u = w$

B) $\displaystyle u = v$

C) $\displaystyle u = \frac{2}{3}v$

D) $\displaystyle u = \frac{3}{2}v$

E) $\displaystyle u = 3v$

Please explain why to make me understand.