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Z in (-oo:+oo)
Z/5-7 = 11/4 // - 11/4
Z/5-(11/4)-7 = 0
Z/5-11/4-7 = 0
1/5*Z-39/4 = 0 // + 39/4
1/5*Z = 39/4 // : 1/5
Z = 39/4/1/5
Z = 195/4
Z = 195/4
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