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z in (-oo:+oo)
(-4/5)*(z-10)-(1/10) = 0
(-4/5)*(z-10)-1/10 = 0
-4/5*(z-10)-1/10 = 0
(-4/5*10*(z-10))/10-1/10 = 0
-4/5*10*(z-10)-1 = 0
79-8*z = 0
(79-8*z)/10 = 0
(79-8*z)/10 = 0 // * 10
79-8*z = 0
79-8*z = 0 // - 79
-8*z = -79 // : -8
z = -79/(-8)
z = 79/8
z = 79/8
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