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Z in (-oo:+oo)
Z/5-6 = 21/5 // - 21/5
Z/5-(21/5)-6 = 0
Z/5-21/5-6 = 0
1/5*Z-51/5 = 0 // + 51/5
1/5*Z = 51/5 // : 1/5
Z = 51/5/1/5
Z = 51
Z = 51
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