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z in (-oo:+oo)
(1/2)*z-(1/2) = 5 // - 5
(1/2)*z-(1/2)-5 = 0
(1/2)*z-1/2-5 = 0
1/2*z-11/2 = 0 // + 11/2
1/2*z = 11/2 // : 1/2
z = 11/2/1/2
z = 11
z = 11
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