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n in (-oo:+oo)
n/10 = 4/8 // - 4/8
n/10-(4/8) = 0
n/10-1/2 = 0
1/10*n-1/2 = 0 // + 1/2
1/10*n = 1/2 // : 1/10
n = 1/2/1/10
n = 5
n = 5
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