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Z in (-oo:+oo)
Z/8.2 = 8.4 // - 8.4
Z/8.2-8.4 = 0
0.12195122*Z-8.4 = 0 // + 8.4
0.12195122*Z = 8.4 // : 0.12195122
Z = 8.4/0.12195122
Z = 68.87999972
Z = 68.87999972
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