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Z in (-oo:+oo)
Z/2-11.93 = -9.65 // + 9.65
Z/2-11.93+9.65 = 0
1/2*Z-2.28 = 0 // + 2.28
1/2*Z = 2.28 // : 1/2
Z = 2.28/1/2
Z = 4.56
Z = 4.56
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