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z in (-oo:+oo)
(3*z)/(-5) = 3 // - 3
(3*z)/(-5)-3 = 0
-3/5*z-3 = 0 // + 3
-3/5*z = 3 // : -3/5
z = 3/(-3/5)
z = -5
z = -5
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