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z in (-oo:+oo)
(1/3)*z = 3*z-(4/5) // - 3*z-(4/5)
(1/3)*z-(3*z)+4/5 = 0
(1/3)*z-3*z+4/5 = 0
4/5-8/3*z = 0 // - 4/5
-8/3*z = -4/5 // : -8/3
z = -4/5/(-8/3)
z = 3/10
z = 3/10
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