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z in (-oo:+oo)
(5*z)/2 = -6*z-(2/(-2)) // + -6*z-(2/(-2))
(5*z)/2-(-6*z)+2/(-2) = 0
(5*z)/2+6*z+2/(-2) = 0
17/2*z-1 = 0 // + 1
17/2*z = 1 // : 17/2
z = 1/17/2
z = 2/17
z = 2/17
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