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z in (-oo:+oo)
(4/8)*z = 8-(12*z) // - 8-(12*z)
(4/8)*z+12*z-8 = 0
25/2*z-8 = 0 // + 8
25/2*z = 8 // : 25/2
z = 8/25/2
z = 16/25
z = 16/25
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