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## Homework Statement

Given a parallelogram ABCD has vertices A(-1,2,-1), B(2,-1,3) and D(-3,1-3). Find the coordinates of C.

## Homework Equations

## The Attempt at a Solution

I'm extremely confused here. I do not know how to tell which coordinate is for which vertex on the parallelogram. I know this has to do with vector addition, but I can't picture it to solve the problem.