=$\frac{x(w - y) - z(w - y)(w + z)}{(z + w)}$
$\frac{(x - z)(w - y)(w + z)}{(z - w)(z + w)}$
After cancelling out (z + w), you get
$\frac{(x - z)(w - y)}{(z - w)}$
raphael answered the question on January 23, 2017 at 15:29
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