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n in (-oo:+oo)
n/10 = 4/5 // - 4/5
n/10-(4/5) = 0
n/10-4/5 = 0
1/10*n-4/5 = 0 // + 4/5
1/10*n = 4/5 // : 1/10
n = 4/5/1/10
n = 8
n = 8
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