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Z in (-oo:+oo)
Z/5-7 = 31/3 // - 31/3
Z/5-(31/3)-7 = 0
Z/5-31/3-7 = 0
1/5*Z-52/3 = 0 // + 52/3
1/5*Z = 52/3 // : 1/5
Z = 52/3/1/5
Z = 260/3
Z = 260/3
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