Question: simplify (e-d)/(2e+d) x (2e+d)(d-3)/(d-e).
The expression is: (e-d)/(2e+d) x (2e+d)(d-3)/(d-e)
First of all, you have the term (2e+d) on top and bottom, so it cancels out. This leaves us with,
(e-d) x (d-3)/(d-e)
Now we see that (e-d) is just the negative of (d-e), so we can write the expression as,
-(d-e) x (d-3)/(d-e)
And the (d-e) cancels out on top and bottom. Leaving us with
-(d-3)
Or,
(3-d)