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n in (-oo:+oo)
3/5 = (n-7)/8 // - (n-7)/8
3/5-((n-7)/8) = 0
(-1*(n-7))/8+3/5 = 0
(-1*5*(n-7))/(5*8)+(3*8)/(5*8) = 0
3*8-1*5*(n-7) = 0
59-5*n = 0
(59-5*n)/(5*8) = 0
(59-5*n)/(5*8) = 0 // * 5*8
59-5*n = 0
59-5*n = 0 // - 59
-5*n = -59 // : -5
n = -59/(-5)
n = 59/5
n = 59/5
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