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z in (-oo:+oo)
(3*8*z)/4 = 9*z+5/4 // - 9*z+5/4
(3*8*z)/4-(9*z)-(5/4) = 0
(3*8*z)/4-9*z-5/4 = 0
-3*z-5/4 = 0 // + 5/4
-3*z = 5/4 // : -3
z = 5/4/(-3)
z = -5/12
z = -5/12
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