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z in (-oo:+oo)
(4*z)/(-5) = 6 // - 6
(4*z)/(-5)-6 = 0
-4/5*z-6 = 0 // + 6
-4/5*z = 6 // : -4/5
z = 6/(-4/5)
z = -15/2
z = -15/2
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