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z in (-oo:+oo)
(1-2*z)/(-3) = 5 // - 5
(1-2*z)/(-3)-5 = 0
(1-2*z)/(-3)+(-5*(-3))/(-3) = 0
1-2*z-5*(-3) = 0
16-2*z = 0
(16-2*z)/(-3) = 0
(16-2*z)/(-3) = 0 // * -3
16-2*z = 0
16-2*z = 0 // - 16
-2*z = -16 // : -2
z = -16/(-2)
z = 8
z = 8
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