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z in (-oo:+oo)
z/3-(3*z)+1/2 = -1/3 // + -1/3
z/3-(3*z)+1/2-(-1/3) = 0
z/3-3*z+1/2+1/3 = 0
5/6-8/3*z = 0 // - 5/6
-8/3*z = -5/6 // : -8/3
z = -5/6/(-8/3)
z = 5/16
z = 5/16
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