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n in (-oo:+oo)
n/30 = 8/20 // - 8/20
n/30-(8/20) = 0
n/30-2/5 = 0
1/30*n-2/5 = 0 // + 2/5
1/30*n = 2/5 // : 1/30
n = 2/5/1/30
n = 12
n = 12
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