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Z in (-oo:+oo)
(4*Z)/10-8 = -3 // + 3
(4*Z)/10-8+3 = 0
2/5*Z-5 = 0 // + 5
2/5*Z = 5 // : 2/5
Z = 5/2/5
Z = 25/2
Z = 25/2
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