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n in (-oo:+oo)
n/5 = 7/8 // - 7/8
n/5-(7/8) = 0
n/5-7/8 = 0
1/5*n-7/8 = 0 // + 7/8
1/5*n = 7/8 // : 1/5
n = 7/8/1/5
n = 35/8
n = 35/8
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