This is to be solved from similarity of triangles, so according to similar triangles' rules, The ratio of the length of side DC to the length of side AC is equal to the ratio of the length of side ED to the side AB. So we can solve from the proportion, 
Combine like terms x+x-x+y+y+y-z+z-z
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An odd function is a function of a form where n is an odd number.
Some examples would be functions:
.
A formal definition of odd function is the following.
(Algebraic proof).
Let (real function).
The function is odd if the below equation is true for all x and -x for which the function is defined:
.
Hope this helps.