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z in (-oo:+oo)
1/2-3*z = 8 // - 8
1/2-3*z-8 = 0
-3*z-15/2 = 0 // + 15/2
-3*z = 15/2 // : -3
z = 15/2/(-3)
z = -5/2
z = -5/2
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