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z in (-oo:+oo)
(7/5)*z-(6*z) = 3 // - 3
(7/5)*z-(6*z)-3 = 0
(7/5)*z-6*z-3 = 0
-23/5*z-3 = 0 // + 3
-23/5*z = 3 // : -23/5
z = 3/(-23/5)
z = -15/23
z = -15/23
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