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Z in (-oo:+oo)
Z/6-(5/8) = 7/8 // - 7/8
Z/6-(5/8)-(7/8) = 0
Z/6-5/8-7/8 = 0
1/6*Z-3/2 = 0 // + 3/2
1/6*Z = 3/2 // : 1/6
Z = 3/2/1/6
Z = 9
Z = 9
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