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Z in (-oo:+oo)
Z/5-6 = 21/3 // - 21/3
Z/5-(21/3)-6 = 0
Z/5-7-6 = 0
1/5*Z-13 = 0 // + 13
1/5*Z = 13 // : 1/5
Z = 13/1/5
Z = 65
Z = 65
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