Hi,



much like one like this  1st step is to find the Lowest Common Denominator

Exploring the Denominators and factoring them:

(z^2+z-6)   ⇒ (z+3)(z-2)

(z^2-2z-15) ⇒ (z-5)(z+3)

(z^2-7z+10) ⇒ (z-5)(z-2)

LCD is (z+3)(z-2)(z-5)



 Simplify the Numerator and Your done. 

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