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z in (-oo:+oo)
1/2-(3*z)+12 = z+14.5 // - z+14.5
1/2-(3*z)-z-14.5+12 = 0
1/2-3*z-z-14.5+12 = 0
-4*z-2 = 0 // + 2
-4*z = 2 // : -4
z = 2/(-4)
z = -1/2
z = -1/2
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