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z in (-oo:+oo)
(2*z)/4 = 8/5 // - 8/5
(2*z)/4-(8/5) = 0
(2*z)/4-8/5 = 0
1/2*z-8/5 = 0 // + 8/5
1/2*z = 8/5 // : 1/2
z = 8/5/1/2
z = 16/5
z = 16/5
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