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z in (-oo:+oo)
(3*z)/8-4 = 4 // - 4
(3*z)/8-4-4 = 0
3/8*z-8 = 0 // + 8
3/8*z = 8 // : 3/8
z = 8/3/8
z = 64/3
z = 64/3
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