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n in (-oo:+oo)
n/30 = 12/15 // - 12/15
n/30-(12/15) = 0
n/30-4/5 = 0
1/30*n-4/5 = 0 // + 4/5
1/30*n = 4/5 // : 1/30
n = 4/5/1/30
n = 24
n = 24
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