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Z in (-oo:+oo)
Z/10 = 45/50 // - 45/50
Z/10-(45/50) = 0
Z/10-9/10 = 0
1/10*Z-9/10 = 0 // + 9/10
1/10*Z = 9/10 // : 1/10
Z = 9/10/1/10
Z = 9
Z = 9
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