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z in (-oo:+oo)
(4/5)*z+z = 8 // - 8
(4/5)*z+z-8 = 0
9/5*z-8 = 0 // + 8
9/5*z = 8 // : 9/5
z = 8/9/5
z = 40/9
z = 40/9
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