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z in (-oo:+oo)
(-1/2)*z-1 = 4/3 // - 4/3
(-1/2)*z-(4/3)-1 = 0
(-1/2)*z-4/3-1 = 0
-1/2*z-7/3 = 0 // + 7/3
-1/2*z = 7/3 // : -1/2
z = 7/3/(-1/2)
z = -14/3
z = -14/3
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