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z in (-oo:+oo)
z/5-7 = (1/1)/8 // - (1/1)/8
z/5-((1/1)/8)-7 = 0
z/5-1/8-7 = 0
1/5*z-57/8 = 0 // + 57/8
1/5*z = 57/8 // : 1/5
z = 57/8/1/5
z = 285/8
z = 285/8
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