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z in (-oo:+oo)
z/5-5 = 11/8 // - 11/8
z/5-(11/8)-5 = 0
z/5-11/8-5 = 0
1/5*z-51/8 = 0 // + 51/8
1/5*z = 51/8 // : 1/5
z = 51/8/1/5
z = 255/8
z = 255/8
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