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Z in (-oo:+oo)
1/2-5*Z = 13 // - 13
1/2-5*Z-13 = 0
-5*Z-25/2 = 0 // + 25/2
-5*Z = 25/2 // : -5
Z = 25/2/(-5)
Z = -5/2
Z = -5/2
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