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z in (-oo:+oo)
z/5-6 = 15/6 // - 15/6
z/5-(15/6)-6 = 0
z/5-5/2-6 = 0
1/5*z-17/2 = 0 // + 17/2
1/5*z = 17/2 // : 1/5
z = 17/2/1/5
z = 85/2
z = 85/2
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