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Z in (-oo:+oo)
Z/8.5 = 3 // - 3
Z/8.5-3 = 0
0.11764706*Z-3 = 0 // + 3
0.11764706*Z = 3 // : 0.11764706
Z = 3/0.11764706
Z = 25.49999975
Z = 25.49999975
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