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z in (-oo:+oo)
(2/10)*z-9 = 6-((5/8)*(2*z+1)) // - 6-((5/8)*(2*z+1))
(5/8)*(2*z+1)+(2/10)*z-9-6 = 0
5/8*(2*z+1)+z/5-9-6 = 0
(5/8*5*(2*z+1))/5+z/5+(-9*5)/5+(-6*5)/5 = 0
5/8*5*(2*z+1)+z-9*5-6*5 = 0
29/4*z-45-30+25/8 = 0
29/4*z-335/8-30 = 0
29/4*z-575/8 = 0
(29/4*z-575/8)/5 = 0
(29/4*z-575/8)/5 = 0 // * 5
29/4*z-575/8 = 0
29/4*z-575/8 = 0 // + 575/8
29/4*z = 575/8 // : 29/4
z = 575/8/29/4
z = 575/58
z = 575/58
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