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Z in (-oo:+oo)
Z/2.8 = -6.2 // + 6.2
Z/2.8+6.2 = 0
0.35714286*Z+6.2 = 0 // - 6.2
0.35714286*Z = -6.2 // : 0.35714286
Z = -6.2/0.35714286
Z = -17.35999986
Z = -17.35999986
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