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z in (-oo:+oo)
(5*z)/4 = 5/6 // - 5/6
(5*z)/4-(5/6) = 0
(5*z)/4-5/6 = 0
5/4*z-5/6 = 0 // + 5/6
5/4*z = 5/6 // : 5/4
z = 5/6/5/4
z = 2/3
z = 2/3
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