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n in (-oo:+oo)
n/10 = 6/20 // - 6/20
n/10-(6/20) = 0
n/10-3/10 = 0
1/10*n-3/10 = 0 // + 3/10
1/10*n = 3/10 // : 1/10
n = 3/10/1/10
n = 3
n = 3
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