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Z in (-oo:+oo)
Z/(-3) = -4.2 // + 4.2
Z/(-3)+4.2 = 0
4.2-1/3*Z = 0 // - 4.2
-1/3*Z = -4.2 // : -1/3
Z = -4.2/(-1/3)
Z = 12.60000013
Z = 12.60000013
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