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n in (-oo:+oo)
n/10 = 15/25 // - 15/25
n/10-(15/25) = 0
n/10-3/5 = 0
1/10*n-3/5 = 0 // + 3/5
1/10*n = 3/5 // : 1/10
n = 3/5/1/10
n = 6
n = 6
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