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