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5/z+3 + 5/z^2-9
= 5/z+3 = -5/z^2-9
= -5z+(-15) = 5z^2-45
= 5z^2-45+5z+15=0
=5z^2+5z-30=0
= (5z-10) (z+3)
= x1= 10 x2= -3