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Z in (-oo:+oo)
12 = 15*Z-(1/5) // - 15*Z-(1/5)
1/5-(15*Z)+12 = 0
1/5-15*Z+12 = 0
61/5-15*Z = 0 // - 61/5
-15*Z = -61/5 // : -15
Z = -61/5/(-15)
Z = 61/75
Z = 61/75
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