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n in (-oo:+oo)
n/10 = 40/25 // - 40/25
n/10-(40/25) = 0
n/10-8/5 = 0
1/10*n-8/5 = 0 // + 8/5
1/10*n = 8/5 // : 1/10
n = 8/5/1/10
n = 16
n = 16
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