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n in (-oo:+oo)
n/5 = 21/35 // - 21/35
n/5-(21/35) = 0
n/5-3/5 = 0
1/5*n-3/5 = 0 // + 3/5
1/5*n = 3/5 // : 1/5
n = 3/5/1/5
n = 3
n = 3
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