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Z in (-oo:+oo)
Z/12 = 12/4 // - 12/4
Z/12-(12/4) = 0
Z/12-3 = 0
1/12*Z-3 = 0 // + 3
1/12*Z = 3 // : 1/12
Z = 3/1/12
Z = 36
Z = 36
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