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z in (-oo:+oo)
(4*z)/5-((3*z)/8) = 1 // - 1
(4*z)/5-((3*z)/8)-1 = 0
(4*z)/5+(-3/8)*z-1 = 0
17/40*z-1 = 0 // + 1
17/40*z = 1 // : 17/40
z = 1/17/40
z = 40/17
z = 40/17
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