In the diagram of parallelogram ABCD, if DB = 5x + 2 and ED = 4x - 8, what is EB?

Answer:
5x+2−(4x−8)
Distribute the Negative Sign:
=5x + 2 + −1(4x−8)
=5x + 2 + −1(4x) + (−1)(−8)
=5x + 2 + −4x + 8
Combine Like Terms:
=5x + 2 + −4x + 8
=(5x + −4x) + (2+8)
=x + 10