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z in (-oo:+oo)
8*z-(5/3) = z-((9*z)/4)-(7/5) // - z-((9*z)/4)-(7/5)
8*z-z+(9*z)/4-(5/3)+7/5 = 0
8*z-z+(9*z)/4-5/3+7/5 = 0
37/4*z-4/15 = 0 // + 4/15
37/4*z = 4/15 // : 37/4
z = 4/15/37/4
z = 16/555
z = 16/555
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