Answer
See image. Instructions are below.
Work Step by Step
$a.$
Translate the vector ${\bf -v}$ so it starts where$ {\bf u}$ terminates.
Join the start of ${\bf u}$ with the end of ${\bf -v}$.
$b.$
Translate the vector ${\bf w}$ so it starts where $ {\bf u-v}$ terminates.
Join the start of ${\bf u-v}$ with the end of ${\bf w}$.
$c.$
Translate the vector ${\bf -v}$ so it starts where $ {\bf 2u}$ terminates.
Join the start of ${\bf 2u}$ with the end of ${\bf -v}$.
$d.$
Translate the vector ${\bf v}$ so it starts where $ {\bf u}$ terminates.
Join the start of ${\bf u}$ with the end of ${\bf v} $to obtain ${\bf u+v}$.
Now, translate ${\bf u+v}$ so it starts where ${\bf w}$ ends.
The resultant vector starts and ends at the same point.
The result is the zero vector.
